题目内容

—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“从不，决不”，位于句首时句子用部分倒装，本题情态动词must提到了主语的前面。must与at no time(=not/never)连用的意思是“绝对不行，绝对不允许”。句子意思是“然而，你绝对不能单独在山上滑雪”。
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