问题

Recently people have made great progress in using power of nature to produce electricity

A:going
B:to go
C:go
D:gone

正确答案是：

同类题型

Your bedroom is very dirty. Please________ at once.

er I made mistakes, the teacher pointed them outwith ______

There was such a long queue for coffee at the interval that we _____ gave up.

下列各句中，没有语病的一句是

I don’t know if it _______ next Sunday. If it _______,we will go and fly kites.