单项选择题

An investigation was made into the accident, （）five people were killed.

A．where
B．for that
C．when
D．in which

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单项选择题

Long before children are able to speak a language, （）communicate through facial expressions and by making noises.

A．however
B．they
C．furthermore
D．who

单项选择题

Gravity is sure to play an important part, （）the ball （）into the air won’t go up.

A．as, thrown
B．for, thrown
C．since, throwing
D．as, throwing

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