单项选择题
A. about which B. which C. that D. for which
They found the lecture hard ()A. to be understoodB. to ...
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
It's too expensive for me. I can't()it.A. spendB. costC...
单项选择题It's too expensive for me. I can't()it.
A. spend B. cost C. pay D. afford
"I saw Mary in the library yesterday" "You()her, she i...
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
