单选题 The professor is quite difficult pleased.
A. to please B. to be pleased C. for pleasing D. pleasing

【正确答案】 A

【答案解析】[解析] 本题考查结构应用。句意为：取悦教授相当困难。此句真正的主语是不定式。此句的正常语序应为：To please the professor is difficult.此句常写作：It is difficult to please the professor.因此，答案为A。