单项选择题

(According to) our estimate, only one (out of) three company managers (have been) trained (in the field of) management.

A. According to
B. out of
C. have been
D. in the field of
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单项选择题
The way (which) the different kinds of rock (lie) on one another (helps) to tell the story (of long ago).
A. which
B. lie
C. helps
D. of long ago
单项选择题
(Being felt) that she (had done) (something wonderful), she sat down (to rest).
A. Being felt
B. had done
C. something wonderful
D. to rest
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