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 I learned how to () a bicycle when I was six years old.
多项选择题 A new technique (), the yields as a whole increased by 20 percent
多项选择题 It looks () the family has got a lot of problems
