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Ifyouwanttokeepyourteethhealthy,you’dbetterbrushthem

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问题详情:

Ifyouwanttokeepyourteethhealthy,you’dbetterbrushthem

If you want to keep your teeth healthy, you’d better brush them ________ twice a day.

A. at least                 B. at once         C. at first             D. for example

【回答】

A

知识点:介词和介词短语

题型:选择题

标签:dbetterbrushthem