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1.Schools keep _____ for about two months in summer.

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1.Schools keep _____ for about two months in summer.
A.to open
B.closing
C.closed
2.Mary isn't in.I don't know _______.
A.when she will come back
B.when will she come back
3.He was busy these days .He often________.
A.stays out late
B.stayed out late
.
Ckeep后面用形容词.动词的完成式一般可以做形容词
A宾语从句语序不变
B前面was.后面虽有 often也是 用过去时