问题

The scientists recommend that studies ________ to find out what side effects the medicine might cause.

A:be done
B:should do
C:will be done
D:are done

正确答案是：

同类题型

In the nineteenth century, English became international language.

1Tom. Mary can’t open thebox. can you give ______ a helping hand?

Were you in time for the lecture?— If I ______ told earlier, I would have.[ ]

My English teacher’shumor was ___make every student burst into laughter

He, ______ his father, ___________ ball games.