单项选择题

Mary found it (difficult) to talk (calmly) about (which) she had (experienced) at the station.

A．difficult
B．calmly
C．which
D．experienced
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单项选择题
(As) time (went on), he suffered (such heavy) losses that he was forced (giving up) his business.
A．As
B．went on
C．such heavy
D．giving up
单项选择题
The development of industry has (also) brought (about) large numbers of problems (which) have (to solve).
A．also
B．about
C．which
D．to solve
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