Question

【题目】We can often hear the birds ______ in the countryside in the morning.

A. singing B. to sing

C. sing D. sings

Answer 1

【答案】C

【解析】

试题分析：句意：在农村的上午我们经常可以听到鸟儿叫。hear sb doing sth 听见某人做某事；hear sb

do sth听见某人做某事。当用doing时表示动作正在进行。当用do时表示动作的全过程。所以选C。