a fortnight ago的用法和样例：
- We had a big snow here a fortnight ago.
- I left them a fortnight ago, owing to a disaement with the president Mr. Lau.
- The German side wasted all that generosity we showed them a fortnight ago.
- Mikhail: He lies! Randolph the drunk almost killed a man just a fortnight ago over losing a bet, and now he hangs!
- But in recent months he canceled engagements and a fortnight ago announced that, on his doctor's advice, he was retiring as a conductor.