问题
单项选择题
The earth, ______is the fifth largest planet in the solar system, is the third planet from the sun.
A．who
B．whom
C．which
D．that
答案
参考答案：C
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The earth, ______is the fifth largest planet in the solar system, is the third planet from the sun.
A．who
B．whom
C．which
D．that
参考答案：C