单项选择题

The US government expressed their appreciation for our effort to ______ the well-being of the crew.

A．see about
B．bring about
C．set about
D．go about
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单项选择题
When you light the end of the lamp wick which is not ______ in kerosene as the other end is, it will burst into flame.
A．restrain
B．immerse
C．purify
D．deform
单项选择题
Readers will find that a library's collection of books usually ______ two categories: fiction and non-fiction.
A．falls into
B．runs into
C．separates into
D．turns into
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