“Show me your permit, please.” “Oh, it’s not in my pocket. It ______.”
A．might fall outB．could fall out
C．should have fallen outD．must have fallen out
D
既然“通行證現(xiàn)在不在口袋里”，那么它“掉出去”應(yīng)發(fā)生在過去，故排除A和B。比較選項C和D所表示的意思，選D更恰當。
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