We can see light in his office. He be in his office.A. canB. can'tC. mustD. might

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A. can
B. can't
(答案→)C. must
D. might
解析：考查情态动词用法。A可能；B不可能；C一定；D也许；对现在情况进行推测使用：情态动词+动词原形；结合句意可知C正确。句意：我们能看见他办公室里的灯。和一定还在办公室里。