问题: My teacher got angry by____earlier.
My teacher got angry by____earlier.
A.Mary not to tell her the truth
B.Mary's not to tell her the truth
C.Mary not telling her the truth
D.Mary not tell him the truth
(Which is right,and why?)
解答:
C// by 在 这里是表示原因的介词，介词后面接动词要用doing形式。
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