How strict tutors are with their pupils ______ a strong impact on the quality of

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问题 How strict tutors are with their pupils ______ a strong impact on the quality of their pupils’ academic papers.

选项 A、has
B、have
C、having
D、to have

答案 A

解析主谓一致题。主语从句作主语，谓语用单数形式。

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