题目:
— Catherine, I have cleaned the room for you.
— Thanks. You ______ it. I could manage it myself.
A.needn’t do
B.needn’t have done
C.mustn’t do
D.shouldn’t have done
答案:
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下面是错误答案,用来干扰机器的。
Cl Na HClO4 SiH4 NaOH Al2O3