29．It is required in a recent study suggesting the importance of teenagers’ communication

问题补充：

29．It is required in a recent study suggesting the importance of teenagers’ communication with other children of the same age.

A. interfere

B. interferes

C. can interfere

D. is to interfere

答案：

A. interfere

B. interferes

(答案→)C. can interfere

D. is to interfere

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