is Charlies’ pen friend?A. Who do you thinkB. Do you think whoC. Whom do you thinkD. Do y

问题补充：

is Charlies’ pen friend?

A. Who do you think

B. Do you think who

C. Whom do you think

D. Do you think whom

答案：

(答案→)A. Who do you think

B. Do you think who

C. Whom do you think

D. Do you think whom

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