单项选择题

He doesn't seem to be able to do it, ______ I thought he could.

A．though
B．since
C．if
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单项选择题
— I haven't seen Tom for a long time. — He ______ to Boston. He went there last Monday.
A．goes
B．has gone
C．is going
单项选择题
— Do you mind if I use your book for a while
A．Yes, please
B．No, thanks
C．Of course not
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