The student did what they the old man.A.could helpB.could helpingC.could to help
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The student did what they ___ the old man.
A.could help
B.could helping
C.could to help
D.might help
试题答案
C

The student did what they ___ the old man.
A.could help
B.could helping
C.could to help
D.might help
C