It is hard to say what kind of person he is．Sometimes he is very friendly; at other times he ___ be very cold．
A．canB．mustC．willD．shall
A

試題分析：句意：很難說他是哪種人，有時(shí)他很友好，也有時(shí)候他可能非常的冷淡。 can
表示推測，意為“可能”；must表示主觀看法，意為“必須、一定”； will表示意愿；shall表示征求對(duì)方意見，根據(jù)題意，故選A。
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