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