单项选择题

As far as I know, the production of this factory has doubled this year, and the quality of its products has been improved __________.

A．since then
B．by then
C．until now
D．as well
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单项选择题
When the man with glasses came into the hotel, I noticed a __________ look come over the manager’s face.
A．surprised
B．surprising
C．surprise
D．surprisingly
单项选择题
By the time Neil Armstrong and Edwin Aldrin walked on the moon in 1969, there ________ many space explorations.
A．will have been
B．had been
C．have been
D．must be
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