—Can we ski on this mountain??
—Of course.However, at no time _______ you do so alone.?
A．couldB．might
C．needD．must?
D?
at no time意思是“從不，決不”，位于句首時句子用部分倒裝，本題情態(tài)動詞must提到了主語的前面。must與at no time(=not/never)連用的意思是“絕對不行，絕對不允許”。句子意思是“然而，你絕對不能單獨在山上滑雪”。
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