You must make sure your mask (口罩) is clean ________ you put it on.
- A.before
- B.after
- C.since
- D.where
正确答案及解析
正确答案
A
解析
在你戴上口罩之前，必须确保它是干净的。
考查连词辨析。before在……之前；after在……之后；since自从；where在……地方。根据You must make sure your mask is clean及you put it on，可知，是在戴口罩前确保它是干净得，故选A。
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