单项选择题

A．An earthquake.
B．A heavy storm.
C．The eruption of a volcano.
D．The seasonal win
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单项选择题
A．foodB．oilC．waterD．medical care
A．food
B．oil
C．water
D．medical care
单项选择题
Most embedded clauses require an introductory word called a subordinator, such as that, until, before, ______ and so on.
A．so
B．if
C．for
D．but
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