问题

It is impossible for humans to live on the moon_______ there is no water_______ air there.
A:so; and
B:because; and
C:if; or
D:because; or;
B:because; and
C:if; or
D:because; or;
正确答案是:
同类题型
Only by increasing the number of doctors by 50 percent ________ properly in this hospital.
He said, “ Light travels much faster than sound.”— He said that light _______ much faster than sound
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