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
It was not until()that()to prepare his lessons.
A.did his father come in, the boy began
B.did his father come in, did the boy begin
C.his father came in, the boy began
D.his father came in, did the boy begin
