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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(The) climate (here) is often said (to be) similar to (one) of Japan.
A. The
B. here
C. to be
D. one
单项选择题
I (had spent) months (to build) my fiberglass boat, now that it was ready, I wanted (all my friends) to come and see (it).
A. had spent
B. to build
C. all my friends
D. it
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