—I wonder why Mr Green hasn't showed up at the meeting yet.
—I'm not sure，but he________in a traffic jam driving here.
A．could be stuckB．might have been stuck
C．might be stuckD．must have been stuck
B

試題分析：句意：——我想知道為什么格林先生還沒(méi)有出現(xiàn)在會(huì)議上。——我不確定,但是他可能開(kāi)車來(lái)這里的路上遇到了交通堵塞。根據(jù)hasn't showed up可知格林先生現(xiàn)在還沒(méi)有出現(xiàn)，那他遇到交通堵塞應(yīng)在現(xiàn)在之前，過(guò)去的時(shí)刻，情態(tài)動(dòng)詞+have+done表示過(guò)去，因此排除AC。must 表示又把我的推測(cè)“一定”，might表示沒(méi)有把我的推測(cè)，“也許，可能”，根據(jù) I'm not sure我不確定，選B。
考點(diǎn)：
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