问题
选择题
Nuclear ______ be really dangerous at times even though it is a nice energy in general.
[ ]
A. shall
B. should
C. can
D. must
答案
答案：C
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Nuclear ______ be really dangerous at times even though it is a nice energy in general.
[ ]
A. shall
B. should
C. can
D. must
答案：C
