Question

15. 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

Answer 1

15.   B 4查非谓语动词。句意：他在过去的这些年里在那个偏远的地区种树所付出的时间和精力现在被认为是很值得的。短语devote sth to sth中to是介词，故lo之后应为名词或动名词形式。此处表示把时间和精力花费在了种树上，所以应为devote time and effort to planting trees。 故选B。