单项选择题

(A number of) foreign visitors (were taken) to the industrial exhibition (which) they (saw) many new products.

A．A number of
B．were taken
C．which
D．saw
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Two days (past) (before) he (realized) that the task was (beyond his capacity).
A．past
B．before
C．realized
D．beyond his capacity
单项选择题
The news (coming) from (different parts) of the world (are) often extremely (discouraging) these days.
A．coming
B．different parts
C．are
D．discouraging
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