Question

I can hear many birds________ in the trees. A. to sing B. singed C. singing D. sings

Answer 1

I can hear many birds________ in the trees.
A. to sing B. singed C. singing D. sings
选项是C。
hear sb/sth doing sth听见某人/某物正在做某事。现在分词singing做hear的【宾语birds】的补足语。
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Answer 2

C
听见是一个现在时，所以鸟唱歌要用进行时
hear doing sth.是一个搭配