_____ I heard his voice trembling did I realize what trouble he was in.
| A．Only when | B．Until when | C．No sooner had | D．Hardly had |
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 |
It is almost five years__________ we saw each other last time.
| A．before | B．since | C．after | D．when |
There were dirty marks on her trousers __________she had wiped her hands.
| A．where | B．which | C．when | D．that |