湖南省怀化市2014年高三第二次模拟考试)27. The retired teacher is said to have returned from the USA, where he ______ by some of his old students.
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A
would be visited
B
visited
C
had been visited
D
have been visited
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Large quantities of oil      in a place near my hometown recently. 
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A
has discovered
B
have discovered
C
has been discovered
D
have been discovered
Helen ________ her keys in the office so she had to wait until her husband ______ home. 
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A
has left; comes
B
left; had come
C
had left; came
D
had left; would come