问题

The time and effort he has devoted during the past few years________ trees in that remote area is now considered to be of great value．

A:to plant
B:to planting
C:plant
D:planting;

正确答案是：

同类题型

Is your Uncle Tom a soldier— No, but he once ______ in the army for 4 years.

Professor Smith. I didn’t finishthe assignment yesterday.—Oh, you___________ have done it asyesterday was the deadline.

Your bag is very nice. —______.

It was March 11, 2011 ____ magnitude-90 earthquake struck Japan and subsequent tsunami triggeredthe large-scale crisis[ ]

did it take you to get to the beach–About two hours’ bus ride.