单项选择题

It is (driving) (on the left) (what) causes visitors to Britain the (most) trouble.

A．driving
B．on the left
C．what
D．most
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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
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
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