问题
选择题
Several scientists are working together to create ______ they hope will be the cheapest form of energy
in the near future. [ ]
A. which
B. that
C. what
D. as
答案
答案：C
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Several scientists are working together to create ______ they hope will be the cheapest form of energy
in the near future. [ ]
A. which
B. that
C. what
D. as
答案：C