123.he will do what he can __ his deskmate with his lessons.A help B helping C to help D helps为何选C

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123.he will do what he can __ his deskmate with his lessons.A help B helping C to help D helps为何选C

123.he will do what he can __ his deskmate with his lessons.A help B helping C to help D helps为何选C
123.he will do what he can __ his deskmate with his lessons.
A help B helping C to help D helps
为何选C

123.he will do what he can __ his deskmate with his lessons.A help B helping C to help D helps为何选C
what he can to do =every thing he can do 固定用法

不定式 作宾语