About 80 percent of the students in our school been working on the program and about two-t

问题补充：

About 80 percent of the students in our school been working on the program and about two-thirds of the work been finished.

A. have; has

B. has; have,

C. have; have

D. has; has

答案：

(答案→)A. have; has

B. has; have,

C. have; have

D. has; has

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