单项选择题
– Would you do me a favor and take me the box upstairs – _____.
单项选择题 – Mr. Smith hasn’t got married, has he – Yes, he has. _____, he has a daughter already.
单项选择题 I’m sure I have seen that man before but I can’t _____ where.
单项选择题 It is difficult to _____ what the long-term effects of the reform will be.
