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
B．were taken
C．which
D．saw
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单项选择题
He (jumped) (over) the fence, ran (across) the field, and (disappearing) into the woods.
A．jumped
B．over
C．across
D．disappearing
单项选择题
(Even though) Sedat (has been studying) English for three years before he came (to the United States), It is still difficult for him (to express himself).
A．Even though
B．has been studying
C．to the United States
D．to express himself
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