I __________the poor rabbit, but I didn’t have the right drugs with me at that moment.
A．could saveB．had savedC．could have savedD．saved
C

試題分析：句意，我本可以救那只可憐的兔子，但是在那個時候，我沒有帶合適的藥。could have done 表示過去本來可以做的事沒做，故選C。
點(diǎn)評：情態(tài)動詞有具體的詞義，但也同助動詞一樣，需要與其他詞語一起構(gòu)成句子的謂語，另外情態(tài)動詞沒有人稱和數(shù)的變化，情態(tài)動詞后必須跟動詞原形。
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