______________ the last bus , he was late and was the last one __________to the destination.
| A．Not having caught ; to get | B．Having not caught ; to get |
| C．Not catching ; getting | D．Hadn’t caught ; to get |
________ 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 |
______is now no doubt ________ global warming is a security threat to us all.
| A．It; that | B．There; that | C．There; whether | D．It; whether |