单项选择题

The gentleman ________ a cherub with his letter.

A．combined
B．included
C．kept
D．enclosed
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单项选择题
The mixture of elements in the air can be thought ________ a solution of gases.
A．of as
B．of
C．as
D．of to
单项选择题
Nancy hasn't begun working on her Ph.D ________ working on her master's.
A．still because she is yet
B．yet as a result she is still
C．yet because she is still
D．still while she is already
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