.No matter how fast we worked, .
A. we couldn’t catch up with them
B. and we couldn’t catch up with them
C. so we couldn’t catch up with them
D. but we couldn’t catch up with them
网友回答
(答案→)A. we couldn’t catch up with them
B. and we couldn’t catch up with them
C. so we couldn’t catch up with them
D. but we couldn’t catch up with them
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