单项选择题

21()

A.either 
B.so 
C.nor 
D.never

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多项选择题
()is terribly tiring working late like()

A. This ; it
B. It ; this
C. What ; it
D. It ; what
多项选择题
John promised to keep his mother () of how things were going on when he studied in England.

A. to be informed
B. to inform
C. informed
D. informing
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