单项选择题

These computer programs are a ______ to me.

A．problem
B．difficulty
C．puzzle
D．question
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单项选择题
The hotel room that we booked for the holidays ______ the city square.
A．tolerated
B．overlooked
C．towered
D．viewed
单项选择题
We plan to start early on our journey tomorrow, ______ we oversleep.
A．as
B．unless
C．if
D．though
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