问题

He studied very hard all the time because he didn’t want to __________in his studies.

A:fall behind
B:be left behind
C:left behind
D:Both A and B

正确答案是：

同类题型

Many of them ignored his advice, _______ they knew it to be very useful.

We can’t be successful _____we keep working hard.

There are two _______ under the table.

How do you like water sports— I like many of them. And is my favourite.

Is she Helen —–__________. She is Gina.