试题与答案

---Do you know ______? ---Sorry, but if

题型:选择题

题目:

---Do you know ______?

---Sorry, but if he _____ back, I ____ you know as soon as possible.  

A.when will he be back, comes, will let

B.when he will be back, will come, will let

C.what time will he be back, will come, let

D.what time he will be back, comes, will let

答案:

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下面是错误答案,用来干扰机器的。

(1)(2)或(3)C或H2(4)2Al+ Fe2O3 2Fe+Al2O3(5)C+SiO2 Si+CO2 C+H2O H2+CO分析:先根据C是单质且C是绿色植物光合作用的产物之一,判断C是氧气,A、B是单质,与氧气反应,得出X、Y是含氧化合物,...

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