题目内容
— Show me your permit, please.
—Oh, it's not in my pocket. It_______.
A. might fall out B. could fall out
C. should have fallen out D. must have fallen out
D
解析:
本题答句中fall out的动作发生于过去,英语中情态动词后加动词的完成式表示对过去动作的猜测,故选D。C项意为“本来应该掉出来”,不合题意。
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