【题目】Lack of sleep _______ lead to weakened immunity and memory, and also slow physical growth.
A. shallB. mustC. shouldD. can
在线课程【答案】D
【解析】
考查情态动词辨析。句意：睡眠不足会导致免疫力和记忆力下降，还会减缓身体发育。A. shall将；B. must必须；C. should应该；D. can会，表示理论上或是逻辑判断上，用can，故选D。
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