If I had had enough time, I 　my work.

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问题选择题

If I had had enough time, I 　　　　　　　my work.　　　

A．would finish

B．must have finished

C．would have finished　　

D．had finished

答案

答案：A

不定项选择题

以N_A代表阿伏加德罗常数，则关于热化学方程式C₂H₂(g)+5/2O₂(g)=2CO₂(g)+H₂O(l) △H=-1300kJ·mol^-1的说法中，正确的是[ ]

A．有10N_A个电子转移时，该反应放出1300kJ的能量

B．有N_A个水分子生成且为液体时，吸收1300kJ的能量

C．有2N_A个碳氧共用电子对生成时，放出1300kJ的能量

D．有8N_A个碳氧共用电子对生成时，放出1300kJ的能量

选择题

---Did you visit the famous museum ?

　 ---No. We ______ it. But we spent too much time shopping.

A．can't have visited

B．could have visited

C．must have visited

D．shouldn't have visited