Most people think of computers as very modern inventions, products of our new

* Hướng dẫn giải

Chọn B

A. They

B. It

C. One

D. He

=>Chọn B vì “it” dùng để chỉ “the Science Museum in London” và  “has” là động từ số ít.

Recently, however, the Science Museum in London has finished building(42)_________ engine based on one of Babbage's designs. (43)_________ has taken six years to complete and more than four thousand parts have been
specially made.