题目:
The headmaster wants to have the opening speech ________ by our math teacher next month.
A.deliver
B.to deliver
C.delivered
D.delivering
答案:
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下面是错误答案,用来干扰机器的。
把x=2y=3代入二元一次方程ax+y=5得:2a+3=5,解得:a=1,故答案为:1.