We have produced twice as much steel this year _____ 4 years ago.
A. than we did
B. as we did
C. than we have produced
D. as we have produced
A. than we did
B. as we did
C. than we have produced
D. as we have produced
【答案】
A. than we did
B. as we did
C. than we have produced
D. as we have produced
A. than we did
B. as we did
C. than we have produced
D. as we have produced
【答案】
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