问题
选择题
They form a polar molecule, ____ is, ____ with a slightly positive end and a slightly negative end.
A．which; that
B．it; one
C．that; one
D．one; that
答案
答案：C
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They form a polar molecule, ____ is, ____ with a slightly positive end and a slightly negative end.
A．which; that
B．it; one
C．that; one
D．one; that
答案：C