问题
选择题
Do you know the equation E = mc2 , _______ is a great achievement in physics. [ ]
A. which
B. that
C. in which
D. what
答案
答案：A
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Do you know the equation E = mc2 , _______ is a great achievement in physics. [ ]
A. which
B. that
C. in which
D. what
答案：A