单项选择题

______ the Hubble Space Telescope, astronomers detected the two small, faint moons orbiting Pluto in the Kupier Belt.

A．To use
B．Using
C．Having used
D．Use
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单项选择题
Beer is the most popular drink among male drinkers ______ overall consumption is significantly higher than that of women.
A．that
B．what
C．which
D．whose
单项选择题
He mast have had an accident, or he ______ now.
A．would have been here
B．had to be here
C．should be here
D．would be here
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