They___laughing as the movie was going on.A.were B.are C.was D.\

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They___laughingasthemoviewasgoingon.A.wereB.areC.wasD.\They___laughingasthemoviewasgoingon.A.wereB.a

They___laughing as the movie was going on.A.were B.are C.was D.\
They___laughing as the movie was going on.A.were B.are C.was D.\

They___laughing as the movie was going on.A.were B.are C.was D.\
A
后半个句子中用了 was going on 所以发生在过去且是在当时某个具体的时刻（as the movie was going on）发生的因此用过去进行时因此是 were laughing
他们一边看电影一边哈哈大笑.
）

were