单项选择题

A) separating C) distinguishing
B) to separating D) to distinguish

A．separating
B．distinguishing
C．to separating D) to distinguish
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单项选择题
A) but C) whileB) and D) or
A．but
B．and
C．while
D．or
单项选择题
A) to make C) that makesB) making D) this makes
A．to make
B．making
C．that makes
D．this makes
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