单项选择题

Under no circumstances _____ be left alone at home.

A．a three-year-old child should
B．should a three-year-old child
C．a three-year-old child should not
D．should a three-year-old child not
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单项选择题
_____ can be seen from the comparison of the two charts, sales of automobiles jumped 3.2 percent in October.
A．As
B．What
C．So
D．That
单项选择题
The question of _____ the traffic accident happened hasn’t been answered yet, though the police have made on-the-spot investigation.
A．that
B．whether
C．how
D．whenever
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