单项选择题

I am (sorry) that (I have kept) you (waited) so (long).

A．sorry
B．I have kept
C．waited
D．long
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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
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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