—I really don't know what I ________yesterday without the bike you lent me.
—Glad to have been some help to you.
A．could doB．should have done
C．had doneD．could have done
D

試題分析：考查虛擬語氣。因為本句是對昨天的情況進行說明，故使用情態(tài)動詞+have done的形式，could have done本可以做某事；should have done本應(yīng)該做某事，實際上卻未做；句意：—我真的不知道沒有你借我的自行車，我昨天可以做什么�！芨吲d能幫到你。故D正確。
點評：對于過去情況的虛擬使用情態(tài)動詞+have done的形式。同時要注意不同的情態(tài)動詞+have done的不同意思。
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