Robert is said abroad, but I don’t know what country he studied in.
| A．to have studied | B．to study |
| C．to be studying | D．to have been studying |
_________，so he didn’t come to school last week.
| A．Though he was ill | B．Being ill |
| C．Having been ill | D．He was ill |
In my opinion，his suggestion__________right or not，should be considered.
| A．if | B．which | C．when | D．whether |
It was quite a long time__________I made it out what had happened.
| A．after | B．before | C．when | D．since |
So long as we study with a strong will，we can answer the question__________hard it is.
| A．no matter what | B．how |
| C．whatever | D．however |
I was so familiar with her that I recognized her voice__________I picked up the phone.
| A．the moment | B．after |
| C．before | D．while |