—Maria likes singing. Do you often hear her after class?—Yes I do. A. singB. to singC. s

问题补充：

—Maria likes singing. Do you often hear her after class?

—Yes, I do.

A. sing

B. to sing

C. sings

D. sang

答案：

(答案→)A. sing

B. to sing

C. sings

D. sang

解析：句意：玛利亚喜欢唱歌。你常在班内听到她唱歌吗？hear后接不带to的不定式做宾语补足语，故选A。