多项选择题

()is terribly tiring working late like()

A. This ; it
B. It ; this
C. What ; it
D. It ; what

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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
多项选择题
A new technique (), the yields as a whole increased by 20 percent

A. working out
B. having worked out
C. having been worked out
D. to have been worked out
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