【題目】I'm too tired, so I ________ sit down and rest every five minutes.
A.must
B.had to
C.have
D.have to

【答案】D
【解析】句意為“我太累了, 所以我不得不每五分鐘坐下來休息一次”。指客觀要求, 用have to。根據(jù)I'm可知用一般現(xiàn)在時(shí),故選D。

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