Question

The Nanjing Yangtze River Bridge is still very strong, ___________ it is almost 43 years old.

A．although

B．but

C．so

D．because

Answer 1

A

本题后句为让步状语从句，意思为虽然南京长江大桥有将近43年，但它仍然很牢固，although表示让步，意思为尽管，故选A。