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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单项选择题
(Even though) Sedat (has been studying) English for three years before came to (the United States), it is still difficult for him (to express himself).
A．Even though
B．has been studying
C．the United States
D．to express himself
单项选择题
(Find answers) (to) these questions (is) something (like) a detective story.
A．Find answers
B．to
C．is
D．like
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