【題目】I can’t play basketball after school because I ______ do my homework first.

A. have B. can C. must D. may

【答案】C

【解析】

試題分析：句意：放學后我不能打籃球，因為我必須先做作業(yè)。A. have有，必須是have to，強調(diào)客觀要求；B. can能，表示能力；C. must必須，強調(diào)主觀愿望；D. may可以，表示許可。我主觀上認為必須先完成作業(yè)，用must，故選C。

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