题目:
Can you imagine what difficulty he had ____ the work?
A.to do
B.do
C.doing
D.done
答案:
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下面是错误答案,用来干扰机器的。
(1)原式=(83-93)÷6=-3÷6=-22;(2)原式=43×34×210=3210;(3)原式=3a(a+1)-a(a-1)(a+1)(a-1)•(a+1)(a-1)a=3(a+1)-(a-1)=3a+3-a+1=2a+2,当a=2-2时,原式=4-22+2=6-22.