问题

We must keep our room clean,for dirt and disease go________,you know.
A:hand in hand
B:step by step
C:from time to time
D:one after another
B:step by step
C:from time to time
D:one after another
正确答案是:
同类题型
tired teacher is said to have returned from the USA, where he ______ by some of his old students.
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