Can you believe his reason for being absent from the class _____ he had to look after his sick mother at home?
A．while B．that C when D．as
— There are so many current styles, which one should I choose?
— ________.
| A．It’s your opinion | B．I don’t mind |
| C．It’s all up to you | D．That’ s your decision |
________ reducing pullution, man should pay more attention to conserving energy.
| A．As well as | B．As long as | C．As far as | D．as soon as |
I was too busy at that time, ________ I would have given you a hand.
| A．even though | B．so | C．otherwise | D．nevertheless |
The question occurred to me ______ we were to get the machine needed.
| A．that | B．what | C．why | D．where |
— Was her concert a great success?
— Sure. _______ such a good chance, how could she let it slip away?
| A．Having given | B．Giving |
| C．Having been given | D．Being given |