He must _____ his sister with her math.

A. try help
B. trying to help
C. trys to help
D. try to help
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科目：初中英語 來源：同步題 題型：單選題

He must _____ his sister with her math.

[     ]

A. try help
B. trying to help
C. trys to help
D. try to help

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