问题
选择题
The argument remains extremely heated ______ there are necessary conditions of existence such
as water on the Mars . [ ]
A. that
B. whether
C. if
D. which
答案
答案：B
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The argument remains extremely heated ______ there are necessary conditions of existence such
as water on the Mars . [ ]
A. that
B. whether
C. if
D. which
答案：B
