问题

Wind power is anancient source of energy _____ we may return in the near future.

A:to which
B:by which
C:fromwhich
D:on which

正确答案是：

同类题型

There is a great deal of evidence _______ that musicactivities engage different parts of the brain.

er she saw theyoung man, she would feel her heart __________

I’ll go for a school trip.—I hope you have a good trip.—__________

It’s raining hard outside. Take an ________， please.

It’s high time that we ___our work and_____ supper now.