72. We couldn’t read the notice on the board because several people were standing it.A. i

问题补充：

72. We couldn’t read the notice on the board because several people were standing it.

A. in front of

B. in the front of

C. at the back of

D. in back of

答案：

(答案→)A. in front of

B. in the front of

C. at the back of

D. in back of

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