单项选择题

—Are you sure ______ you've met him before

A．unless
B．that
C．when
D．though
<上一题 目录 下一题>
热门 试题

单项选择题
—Why didn't you give me a ring—Well, I meant ______ but late I forgot.
A．telephoning
B．to telephone
C．having telephoned
D．to have telephoned
单项选择题
Helen said she would like to go to Atlanta by air, but I wonder if she has enough money to pay for the______.
A．travel
B．tourism
C．journey
D．course
相关试题