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Theteachergavethestudentssuchadifficultmathsproblemnobodyworkeditout.[]A.asB.whichC.thatD.so

题目详情
The teacher gave the students such a difficult maths problem ______ nobody worked it out.

[     ]

A. as
B. which
C. that
D. so
▼优质解答
答案和解析
C