题目内容
-----Can children swim in this pool?
-----Yes. However, at no time _____ they do so alone.
A. may B. need C. could D. should
D
should情态动词,表示“应该”。
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题目内容
-----Can children swim in this pool?
-----Yes. However, at no time _____ they do so alone.
A. may B. need C. could D. should
D
should情态动词,表示“应该”。