单项选择题

______ a fine day, we decided to go out on a picnic.

A. Been
B. Being
C. It was
D. It being
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单项选择题
Modern medicine and new methods of food production allow adults to live longer and babies to ______ , not die soon after birth.
A. survive
B. grow up
C. exist
D. develop
单项选择题
You ______ take your tools in case some machines need repairing.
A. had better
B. would rather
C. would better
D. had rather
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