单项选择题

The dentist has decided to take out the girl's bad tooth.

A．dig
B．draw
C．pull
D．extract
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单项选择题
Holonyak’s colleagues thought he would fail in his research on LEDs at the time when he started it.
A． Right
B． Wrong
C． Not mentioned
单项选择题
Holonyak believed that his students that were working with him on the project would get the Lemelson-MIT Prize sooner or later.
A． Right
B． Wrong
C． Not mentioned
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