Peter said he ______ when he got there but we have never heard from him since then.
| A．was writing | B．would write | C．had written | D．has been writing |
________from heart trouble for years, Professor White has to take some medicine with him wherever he goes.
| A．Suffered | B．To suffer | C．Having suffered | D．Being suffered |
________, the boy couldn't enter his house.
| A．Since the key has lost | B．The key been lost |
| C．Lost the key | D．Having lost the key |
Time________, I can have done it better.
| A．permit | B．be permitted | C．permitting | D．to permit |
_______the exam, the boy was punished by his father.
| A．No passing | B．Having passed | C．Not passing | D．Not having passed |
________hard before, Tom is afraid of failing in the exam.
| A．Having been worked | B．Not to have worked |
| C．Having never worked | D．Never have worked |