问题

Our classroom by us every day!
A:is cleaning
B:has cleaned
C:must clean
D:is cleaned
B:has cleaned
C:must clean
D:is cleaned
正确答案是:
同类题型
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_____ doesittakeyoutofinishyourhomeworkeveryday?—Aboutanhour. [ ]
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Do you know sound travels very fast? — Yes. But light travels sound.