单项选择题

She______fifty or so when I first met her at the conference.

A．must be
B．had been
C．could be
D．must have been
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单项选择题
There are as good fish in the sea ______ ever came out of it.
A．than
B．like
C．as
D．so
单项选择题
If only the patient ______ a different treatment instead of using the antibodies he might still be alive now.
A．had received
B．received
C．should receive
D．were receiving
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