问题

The experiment shows that proper amounts of exercise,if___________regularly, can improve our health[ ]

A: being carried out
B:carrying out
C: carried out
D:to carry out

正确答案是：

同类题型

Bill doesn’t do well in his English. So his father asked a teacher ____ him ____ it.

She didn’t ______ work when she had thebaby

Paul is friendly to us.He always___good solutions to our problems.

Jane, I like singing, what about you— I prefer ________ to______.

Can you finish ____the book in about a week