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（题文）This problem is ______ difficult __________. A. so; that few of us can do B. so; that few of us ...
题目内容：
（题文）This problem is ______ difficult __________.
A. so; that few of us can do
B. so; that few of us can do it
C. too; for anyone of us to do
D. too; for anyone of us to do it
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