The teacher spoke so loudly as clearly in the crowded meeting hall.A. to hearB. to be hea

问题补充：

The teacher spoke so loudly as clearly in the crowded meeting hall.

A. to hear

B. to be heard

C. to listen

D. to be listened

答案：

A. to hear

(答案→)B. to be heard

C. to listen

D. to be listened

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