.It is reported that two exhibition centres are being built in my city will open next ye

问题补充：

.It is reported that two exhibition centres, are being built in my city, will

open next year.

A. they both

B. both of which

C. which both

D. both of them

答案：

A. they both

(答案→)B. both of which

C. which both

D. both of them

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