11.Catherine,I have cleaned the room for you.
Thanks.You _______ it.I could manage it myself.( )
Thanks.You _______ it.I could manage it myself.( )
A. | needn't have done | B. | needn't do | ||
C. | mustn't do | D. | shouldn't have done |
6.A good idea _______ him when he was asked to solve the problem.Which choice is wrong?( )
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A. | hit | B. | happened | C. | struck | D. | occurred to |