897.The Science Museum,__________ we visited during a recent trip to Britain,is one of London’s tourist attractrions.
A.which
B.what
C.that
D.where
898.Occasions are quite rare _____ I have the time to spend a day with my kids.
A.who
B.which
C.why
D.where
897.答案是A;which引导非限制性定语从句，指代先行词the Science Museum,同时又在从句中作visit的宾语。
898.答案是D;先行词是occasion时，通常用when引导定语从句，且在从句中作时间状语。
