问题

Einstein’s most famous theory is ______ we call the Theory of Relativity.
A:what
B:that
C:which
D:why
B:that
C:which
D:why
正确答案是:
同类题型
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orry I didn’t phone you, but I’ve been very busy ____ the past couple weeks.
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I___ten minutes to decide whether I should go orremain. [ ]
______ helped the poor catfind its home— My best friend, Mary.