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题目
题型:不详难度:来源:
They have been skating __________.
A.for three hoursB.since three hours ago
C.three hours agoD.since three hours

答案
A
解析
for 一段时间,为现在完成时态的时间标志,故选答案为A
核心考点
试题【They have been skating __________.A.for three hoursB.since three hours ago C.thr】;主要考察你对过去进行时等知识点的理解。[详细]
举一反三
I don’t know when he _________ tomorrow. If he _________, I’ll let you know.
A.comes, comesB.will come, comes
C.comes, will comeD.came, will come

题型:不详难度:| 查看答案
It _____ sunny today, but it _____ cloudy yesterday.
A.is, isB.was, was C.is, wasD.was, is

题型:不详难度:| 查看答案
--What ______your sister do last night?    
-- She_____ her homework..
A.do, doB.do, didC.did, doesD.did, did

题型:不详难度:| 查看答案
--_____ you often go to the movies? 
--No, but I ___________ last Sunday.
A.Do, goB.Did, goC.Do, didD.Did, do

题型:不详难度:| 查看答案
—I have seen the film Titanic already.
一When_______ you________ it?
A.have;seenB.will;seemC.did;seeD.did;seen

题型:不详难度:| 查看答案
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