20. In many places in China bicycle is still popular means of transportation.A. a; theB

问题补充：

20. In many places in China, bicycle is still popular means of transportation.

A. a; the

B. /; a

C. the; a

D. the; the

答案：

A. a; the

B. /; a

(答案→)C. the; a

D. the; the

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