问题

There is growing tendency among middle-school students___________they will do some voluntary work during their vacation

A:which
B:why
C:how
D:that

正确答案是：

同类题型

There is no doubt the earth is becoming warmer

Do you mind ________ _______ there

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The last story ________ our teacher told us the other day was ________ of an Italian explorer.

Some Math problems are difficult for the students work out.