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I don’t think Mary and Sue _____ before, ______?
A.have met; haven’t theyB.have met; have they
C.have seen; do I D.have seen; don’t they
B
主句是第一人称,而且谓语动词是think, find, believe,make等,反意疑问句要和宾语从句一致;而且还得注意否定的转移问题。
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