He___his homework now.I know he has a lot of homework___.
He___his homework now.I know he has a lot of homework___.
A must be doing/to do B must be doing/doing
C can be doing/to do D can be doing/doing
A must be doing/to do B must be doing/doing
C can be doing/to do D can be doing/doing
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你能帮帮他们吗