问题

often ______ as an activity for youngerchildren, is still important in the social development of teenagers

A:that
B:what
C:how
D:whether

正确答案是：

同类题型

You’re coughing badly, Martin．Why not give up smoking?—- Give up smoking? Easier said than done, Amy．Once you _____ the habit of smoking, it is very hard for you to______．

There is _____ evidence that cars have aharmful effect on the environment.

5.The growing speed of a plant is influenced by a number of factors, _______ are beyond our control.

watched the 2012 London Olympic Games agreedthat some Chinese athletes performed perfectly, such as Sun Yang and Ye Shiwen.

Are these your boxes-No, they’s aren’t. They’re _______.