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. A. as B. that C. which D. the ones 查看更多

 

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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.

[     ]

A. as, that 
B. that, as
C. which, that
D. the ones, which 

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