单项选择题

A．express
B．say
C．talk
D．speak
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单项选择题
Having (finished) his term paper (before the deadline), (it was delivered) to the professor (before) the class.
A．finished
B．before the deadline
C．it was delivered
D．before
单项选择题
We see lightening (before we hear) the thunder it (causes) because sound travels (more slowly) than (light is).
A．before we hear
B．causes
C．more slowly
D．light is
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