单项选择题

Adopting this method, the team raised the average yield ______ 40%.

A. at

B. by
C. to

D. with
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单项选择题
I’m glad that Peter decided to come to the party because we ______ him for several years.
A. haven’t seen
B. don’t see
C. didn’t see
D. hadn’t seen
单项选择题
The house was very quiet, as it was on the side of a mountain.
A. isolated



B. being isolated
C. isolating



D. having been isolated
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