Despite the growing number of people who purchase plane tickets online, airline executives are convinced that, just as one-third of bank customers still prefer human tellers to automatic teller machines, many travelers will still use travel agents.

1. growing number of people who purchase plane tickets online, airline executives are convinced that, just as one-third of bank customers still prefer human tellers to automatic teller machines, many travelers will

2. growing number of people who purchase plane tickets online, airline executives are convinced, just as one-third of bank customers still prefer human tellers to automatic teller machines, that many travelers would

3. growing number of people purchasing plane tickets online, airline executives are convinced, just as one-third of bank customers still prefer human tellers as compared to automatic teller machines, many travelers will

4. fact that the number of people purchasing plane tickets online is growing, airline executives are convinced, just as one-third of bank customers still prefer human tellers as compared to automatic teller machines, that many travelers would

5. fact that the number of people who purchase plane tickets online are growing, airline executives are convinced that, just as one-third of bank customers still prefer human tellers compared with automatic teller machines, many travelers would

正确答案是A,但是很迷惑其中的解释中有这样一点,convinced后面不应该使用虚拟语气,为什么呢?

请知道的人提点一下

提前谢谢了

在使用虚泥语气的动宾从句里,主句都是主动语态.

convinced后面为什么不应使用虚拟语气?

（1）    GWD-10-Q21:

Despite the growing number of people who purchase plane tickets online, airline executives are convinced that, just as one-third of bank customers still prefer human tellers to automatic teller machines, many travelers will still use travel agents.

1. growing number of people who purchase plane tickets online, airline executives are convinced that, just as one-third of bank customers still prefer human tellers to automatic teller machines, many travelers will

2. growing number of people who purchase plane tickets online, airline executives are convinced, just as one-third of bank customers still prefer human tellers to automatic teller machines,[CH1]  that many travelers would

3. growing number of people purchasing plane tickets online, airline executives are convinced[CH2] , just as one-third of bank customers still prefer human tellers as compared to automatic teller machines, many travelers will

4. fact that the number of people purchasing plane tickets online is growing, airline executives are convinced, just as one-third of bank customers still prefer human tellers as compared to automatic teller machines, that[CH3]  many travelers would

5. fact that the number of people who purchase plane tickets online are growing, airline executives are convinced that, just as one-third of bank customers still prefer human tellers compared with automatic teller machines, many travelers would[CH4] 

A is the best

B，插入语不能放到convinced 与that之间，convinced后面不应使用虚拟语气（why？）

C，convinced后面缺少that引导从句，没有正确使用prefer .. to，convinced后面不应使用虚拟语气（why？）

D，fact that表达不简洁，没有正确使用prefer .. to，convinced后面不应使用虚拟语气（why？）

E，fact that表达不简洁，没有正确使用prefer .. to，convinced后面不应使用虚拟语气（why？），are growing与前面number主谓不一致

Prefer…to…

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