In the past decades, sea ice ____ in the Arctic as a result of global warming.[

题型：河南省模拟题难度：来源：

In the past decades, sea ice ____ in the Arctic as a result of global warming.[     ]
A. had melted
B. has been melting
C. melted
D. is melting

答案

举一反三

Tom ________ in the library every night over the last three months．[ ]
A．works
B．worked
C．has been working
D．had been working

题型：江苏模拟题难度：| 查看答案

The development of China"s economy ________ since the 80s of last century. [ ]
A. has been accelerating
B. had accelerated
C.is accelerating
D. accelerated

题型：山东省模拟题难度：| 查看答案

The company a rise in salary for ages but nothing has happened yet. [ ]
A.has been promising
B.had promised
C.promised
D.promises

题型：安徽省同步题难度：| 查看答案

-I"m sure Andrew will win the first prize in the final.
-I think so. He________for it for months．  [     ]
A. is preparing
B.was preparing
C. had been preparing
D.has been preparing

题型：同步题难度：| 查看答案

— How long ______ like this?
— For nearly a week.    A. did it rain
B. has it rained
C. does it rain
D. has it been raining

题型：同步题难度：| 查看答案