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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单项选择题
Many fruit juices are now available in ______ aluminium cans.
A．indispensable
B．smooth
C．handy
D．soft
单项选择题
That farmer has a large ______ of sheep on his farm.
A．flock
B．group
C．part
D．heap
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