单项选择题

Most lecturers find it expedient to use notes when addressing to graduate students.

A．troublesome
B．expensive
C．useful
D．improper
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单项选择题
Prior to his appointment as foreign minister, Mr. Li was the vice minister of foreign affairs.
A．After
B．Before
C．During
D．Previous
单项选择题
The president is often awakened by a noisy crowd which assembles on the White House.
A．concentrates
B．packs
C．squeezes
D．gathers
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