Ifyouwanttokeepyourteethhealthy,you’dbetterbrushthem
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问题详情:
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
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dbetterbrushthem
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