The world’s population has grown by it was in 1800.A. more than six times thatB. six time

问题补充：

The world’s population has grown by it was in 1800.

A. more than six times that

B. six times more than that

C. more than six times what

D. six times as many as

答案：

A. more than six times that

B. six times more than that

(答案→)C. more than six times what

D. six times as many as

解析：此题考查倍数表达，句意：世界的人口应经增长到1800年的六倍多，后一个分句中was后面缺少表语，故用what,所以选C。