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单项选择题

They found the lecture hard ()

A. to be understood
B. to understand
C. for understanding
D. to have been understood

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单项选择题
It's too expensive for me. I can't()it.

A. spend
B. cost
C. pay
D. afford
单项选择题
"I saw Mary in the library yesterday"
"You()her, she is still in hospital."

A. can't have seen
B. mustn't have seen
C. could not see
D. must not see
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