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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单项选择题
Recently there has been a great ________ for small cars that use little petrol.
A．claim
B．application
C．request
D．demand
单项选择题
The visitor was ________ entrance into the museum because he had no ID paper.
A．denied
B．refused
C．prohibited
D．prevented
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