My classmate Andrew went to Vancouver Canada in andsince .A. has not heard ofB. h

问题补充：

My classmate Andrew went to Vancouver , Canada in , andsince .

A. has not heard of

B. had not heard of

C. has not been heard of

D. had not been heard of

答案：

A. has not heard of

B. had not heard of

(答案→)C. has not been heard of

D. had not been heard of

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