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TheUnitedStatesupitssatelliteuntilJanuary31,1958.A.sentB.didn'tsendC.hasn'tsentD.wasn'tsent(麻烦附上sent理由...
题目详情
The United States______up its satellite until January 31,1958.
A.sent
B.didn't send
C.hasn't sent
D.wasn't sent
(麻烦附上sent理由...
A.sent
B.didn't send
C.hasn't sent
D.wasn't sent
(麻烦附上sent理由...
▼优质解答
答案和解析
B.didn't send
决不是选sent
not...until...直到...才...
用过去时,
主语是The U.S.所以不需要用被动,不用D.wasn't sent
可以不用完成时态
当然用也没关系,用的话就是hadn't sent
决不是选sent
not...until...直到...才...
用过去时,
主语是The U.S.所以不需要用被动,不用D.wasn't sent
可以不用完成时态
当然用也没关系,用的话就是hadn't sent
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