单项选择题

A．Go over the list.
B．Co shopping for his mum.
C．List everything his mum needs.
D．Go for an outin
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单项选择题
Perhaps there is still quite a long way to go______ these researchers can find an answer to the mystery.
A．unless
B．until
C．where
D．before
单项选择题
The mercury in the thermometer is______ to changes in temperature.
A．sensitive
B．sensible
C．sentimental
D．sensational
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