The Sydney Opera House is like a huge sailing boat with water three sides.A. atB. ofC. in

问题补充：

The Sydney Opera House is like a huge sailing boat with water three sides.

A. at

B. of

C. in

D. on

答案：

A. at

B. of

C. in

(答案→)D. on

解析： 此题考查介词的基本用法，在某一边，与side连用应用介词on，如：在左边 on the left side,此题中应用on three sides，所以选D。