单项选择题

The natural forms of energy are the sun, the wind, the sea ______ heat from the center of the earth.

A．as well as
B．as well
C．so well as
D．so well
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单项选择题
The passengers and the suitcases ______ were still waiting had to be transferred to another plane.
A．which
B．that
C．who
D．whom
单项选择题
______ I was going out, it began to rain.
A．When
B．While
C．As
D．Since
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