单项选择题

The mechanic used to （） and oil the machine all the time.

A．polish
B．take
C．design
D．lay

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单项选择题

The Japanese dollar-buying make traders eager to （） dollars in fear of another governmental intervention.

A．let off
B．let out
C．let in
D．let go of

单项选择题

Without his glasses, he's （） to smash into a tree.

A．liable
B．possible
C．unlikely
D．convenient

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