以下是引用joywzy在2003-11-7 11:20:00的发言:
mjiehu,我明白了.E中it 没有指代对象.
?会这样嘛? 还是理解为 what patients eat比较好? 下面 83 的例子中, 每个 it 都是有指代的呀! when 引导的句子,在OG中就有,OG 83的B.
83. Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not. (A) a condition when it is present and indicate that there is one (B) when a condition is present and indicate that there is one (C) a condition when it is present and indicate that it is present (D) when a condition is present and indicate its presence (E) the presence of a condition when it is there and indicate its presence
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