单项选择题
The scientists are （） a series of experiments to learn more about how the body
A.defining
B.having
C.carrying
D.doing
The scientists are （） a series of experiments to learn more about how the body
A.defining
B.having
C.carrying
D.doing
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单项选择题
Eventually, they gave up the project to build a bridge over the river because of
Eventually, they gave up the project to build a bridge over the river because of
A.excessively
B.expensively
C.effectively
D.efficiently