单项选择题

In our company, great changes ________ since the new manager came.

A．took place
B．take place
C．will have taken place
D．have taken place
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单项选择题
I don't doubt ______ the stock market will recover from the economic crisis.
A．if
B．what
C．that
D．which
单项选择题
Young ______ he is, he has proved to be an able salesman.
A．that
B．who
C．as
D．which
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