问题

Various efforts over the centuries _________ topredict earthquakes to reduce the damage.

A:are being made
B:have beenmade
C:weremade
D:were being made

正确答案是：

同类题型

ou join us in the game—Thank you,_________ .

97. You’d better stay at school now. Look! The sky is overcast with dark clouds. I’m afraid _____ rain is going to fall.

______ some teenwhat

My uncle the club in 2010. He the club for over 3 years.

What a nice bike! Is it new —No. I have _________it for 2 years.