补充250题之104

pamalas

104.  答案是(B)   我選(A)，但也很奇怪
        前面的appears用現在式，since後面have been found用現在完成式
        跟我熟悉的語法 ex:  We have changed since we parted. 長的不一樣耶
        有沒有程度好的網友，可以告訴我：這一題(B)是對的，and why?
        如果是official guide，我就背起來了，但這不是og裡的題目，所以想請教你們
                                    

For some birds the sense of smell appears to play a role in navigation, since pigeons with surgically removed olfactory nerves were found to have increased difficulties in homing.
(A) were found to have increased difficulties
(B) have been found to have increased difficulty
(C) were found to have increasing difficulty
(D) had been found to have increased difficulties
(E) have been found to have increasing difficulties

l_shasha

because of "since"!

nina23

以下是引用l_shasha在2003-10-10 1:25:00的发言：
because of "since"!

cute reply!

pamalas

我想通了^^"  

我常看到的句子是 Subject + simple past tense + since + past tense 比较多ㄚ...:b

ths~

[此贴子已经被作者于2003-10-10 3:14:03编辑过]