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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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
多项选择题
It looks () the family has got a lot of problems

A. as long as
B. as if
C. while
D. though
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