The professor is quite difficult pleased.A、to pleaseB、to be pleasedC、for pleas

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问题 The professor is quite difficult pleased.

选项 A、to please
B、to be pleased
C、for pleasing
D、pleasing

答案 A

解析结构应用此句是用动词不定式做主语：To please the professor is difficult．此句常写作：It is difficult to please the professor．因此答案为A。

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