The face of the Moon is changed by collisions with meteoroids, _____

单选题 The face of the Moon is changed by collisions with meteoroids, ____________________ new craters to appear.

A．cause
B．causing
C．caused
D．have caused

参考答案B

解析:

单选题 Professor King's book will show you ___________ can be used in other context.

A．that you have observed
B．that how you have observed
C．how that you have observed
D．how what you have observed

单选题 In the experiment we kept a watchful eye __________ the developments and recorded every detail.

A．in
B．at
C．for
D．on

单选题 The program requires more money than ____________________

A．have been put in
B．being put in
C．has been put in
D．to be put in