单项选择题

This is one of the most beautiful songs ______I have ever heard.

A．what
B．which
C．that
D．as
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单项选择题
The patient knew nothing about his illness______ the doctor told him.
A．after
B．while
C．until
D．since
单项选择题
The construction of the laboratory ______by the end of the year.
A．will complete
B．will have completed
C．will be completed
D．will have been completed
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