单项选择题

Evidence (has been put forward) (showing) that astronauts (exposed) to long periods of weightlessness have (affected) quite severely.

A．has been put forward
B．showing
C．exposed
D．affected
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单项选择题
Never before (I have seen) (anyone) who has the skill (John has) when he (repairs) engines.
A．I have seen
B．anyone
C．John has
D．repairs
单项选择题
He thought (that) the aim (of) philosophy (was to) discover the good, (beautiful) and the true.
A．that
B．of
C．was to
D．beautiful
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