真题练习
907.The book was written in 1946,_______ the education system has witnessed great changes.

A.when
B.during which
C.since then
D.since when

908.Chan's restaurant on Baker Street,________ used to be poorly run,is now a successful business.

A.that
B.which
C.who
D.where

答案解析

907.答案是D;since when=since 1946,注意主句要用现在完成时。
908.答案是B;先行词为Chan's restaurant,故选which，并在从句中作主语。