They have been skating __________.A.for three hoursB.since three hours ago C.thr
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They have been skating __________.A.for three hours | B.since three hours ago | C.three hours ago | D.since three hours |
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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 |
举一反三
I don’t know when he _________ tomorrow. If he _________, I’ll let you know. A.comes, comes | B.will come, comes | C.comes, will come | D.came, will come |
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