In the country,I can hear the birds____.填sing or singing?

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In the country,I can hear the birds____.填sing or singing?
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In the country,I can hear the birds____.填sing or singing?
In the country,I can hear the birds____.填sing or singing?

In the country,I can hear the birds____.填sing or singing?
hear sb doing sth
singing

singing

这是原课文/
SINGING背过的

hear sb doing sth

singing, 因为hear sb do sth 是指听到某人作某事,doing 则是正在做.

singing

hear sb doing sth