问题
These boxes ______ for keeping the food clean and cool.
A:use
B:are used
C:have used
D:were using
B:are used
C:have used
D:were using
正确答案是:
同类题型
_____ does it finish? —At half past ten. [ ]
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Dear students, please read every sentence carefully. ______you are, ______mistakes you’ll make.
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