(1/2)请选一个正确答案?The math teacher gave us such a difficult prob

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(1/2)请选一个正确答案?The math teacher gave us such a difficult problem (_)no on

$(1/2)请选一个正确答案?The math teacher gave us such a difficult prob$

as在此引导定语从句,从句必须缺少成分,没有it.“as we couldn't work out.”是定语从句,修饰 problem.
that引导宾语从句,后面的句子应该是完整的：(that )no one can work out it.（必须有it）.

(1/2)请选一个正确答案?The math teacher gave us such a difficult prob Our teacher set us such a difficult math problem _we couldn' the teacher gave us so difficult a problem as most of us can the math teacher gave us some exercises and asked us ______选 The teacher gave us so difficult a problem as we couldn't so The math teacher gave us some exercises and asked us ___. the math teacher gave us some exercise and he asked us-- -- The teacher asked such a difficult question___ no student co our teacher set us such a difficult maths problem we couldn' 请问：The teacher gave us a list of five books each可否写成...gave The teacher gave some pictures to us. The teacher thought her ____and gave her some different math