题目内容
The teacher gave us so difficult a problem _____ we couldn't solve.
The teacher gave us so difficult a problem _____ we couldn't solve it.
The teacher gave us so difficult a problem _____ we couldn't solve it.
[ ]
A. as, that
B. that, as
C. which, that
D. the ones, which
B. that, as
C. which, that
D. the ones, which
A
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