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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单项选择题
These surveys indicate that many crime go ______ by the police, mainly because not all victims report them.
A. unrecorded
B. to be unrecorded
C. unrecording
D. to have been unrecorded
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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