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He _____________ back in an hour
[ ]
A
B
C
D
I ______ he'll be back in an hour.
A. don't think B. had thought
C. hadn't thought D. think not
He will be back in _______ hour.
A.a B.an C.the D.／
He'll be back ______.
A. after half a hour B. after half an hour
C. in half a hour D. in half an hour