It’s hard to say what kind of person he is. Sometimes he is very nice; at other times he _______ be very cold.
A．mustB．willC．shallD．can
D
考查情態(tài)動詞。must 必須，will 將會，shall 將會can 有時候可能會，句意：很難說他是哪種人。有時候他會很和藹，有時候他非常冷酷。所以選D。
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