31.－What are on show in the museum?－Some pictures by middle-school students.A. takingB. h

问题补充：

31.－What are on show in the museum?

－Some pictures by middle-school students.

A. taking

B. having been taken

C. taken

D. being taken

答案：

A. taking

B. having been taken

(答案→)C. taken

D. being taken

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