要解释The little boy was frightened when he heard the _______ of a motorbike.

问题描述:

要解释The little boy was frightened when he heard the _______ of a motorbike.
A.sound\x05B.voice\x05C.cry\x05D.shout

A
sound 声音 各种声音总称
voice指嗓音 美好的声音
cry 哭喊
shout 喊叫声