摘要：2078] -----Can children swim in this pool? -----Yes. However, at no time they do so alone. [译文] --这个池子里能游泳吗? --能.但是.绝不能让孩子单独游泳. A. may B. need C. could D. should [答案及简析] D. should情态动词.表示“应该 .

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