At school our teachers do all they can ___us with our lessons.A.helpB.helpingC.to helpD.helped我选A,why?

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Atschoolourteachersdoalltheycan___uswithourlessons.A.helpB.helpingC.tohelpD.helped我选A,why?Atschoolou

At school our teachers do all they can ___us with our lessons.A.helpB.helpingC.to helpD.helped我选A,why?
At school our teachers do all they can ___us with our lessons.
A.help
B.helping
C.to help
D.helped
我选A,why?

At school our teachers do all they can ___us with our lessons.A.helpB.helpingC.to helpD.helped我选A,why?
A
can 是情态动词 后加动词原形

A