单项选择题

In the wine shops, the wine jars were in place, and on one counter could be seen a stain ______a customer had thrown down his glass and fled.

A．where
B．that
C．which
D．how
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单项选择题
Researchers______ that genes may determine the strength of the immune system which could help explain how an infectious disease could have a hereditary link.
A．speculate
B．estimate
C．evaluate
D．anticipate
单项选择题
Prior to our conference, the executive director had requested that everyone______ well prepared.
A．is
B．be
C．was
D．will be
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