Teachers recommend parents their children under 12 to ride bicycles to school for safety.A

问题补充：

Teachers recommend parents their children under 12 to ride bicycles to school for safety.

A. not allow

B. do not allow

C. mustn’t allow

D. couldn’t allow

答案：

(答案→)A. not allow

B. do not allow

C. mustn’t allow

D. couldn’t allow

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