单项选择题
It is difficult ______ a world record and even more difficult to ______ it.
A.keeping, set
B.keep, set
C.set, keep
D.to set, keep
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单项选择题
The doctor ______ my forehead and said, Your forehead ______ hot.
A.felt, feels
B.felt, was felt
C.feels, felt
D.feels, is felt
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单项选择题
Mary ______ her keys in her office and she had to ______ out of the house.
A.forgot, keep
B.forget, keep
C.left, be kept
D.leaved, be kept
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