With后加系动词单数还是复数?The boy with his classmates (be) singing.

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With后加系动词单数还是复数?The boy with his classmates (be) singing.
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With后加系动词单数还是复数?The boy with his classmates (be) singing.
With后加系动词单数还是复数?
The boy with his classmates (be) singing.

With后加系动词单数还是复数?The boy with his classmates (be) singing.
is 主语是the boy

用单属形式,这里with表伴随,因此填is