Question

The largest collection of coins in England was one of 200,000 silver pennies ________ over 600 years old.

1. A.
   all of which
2. B.
   all of them were
3. C.
   all of them
4. D.
   any of which

Answer 1

C
兩個(gè)完整的句子之間要有連詞（此句中可用and或which，后面部分加系動(dòng)詞），或者用獨(dú)立主格（C）。