If he_____the storekeeper ‘s scissors ，he would have forgotten to buy a pair.
A. would not see
B. had not seen
C. having not seen
D. has not seen
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He didn‘t seem to mind_____the music while he was studying.
A. them listening
B. them to listen to
C. when she returned
D. that did she return
It seems as if the sun_____round the earth since it rises in the east and sets in the west.
A. circles
B. is circling
C. has been circling
D. were circling
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