1. Luckily, we d brought a road map without_we would have lost our way.
A. it
B. that
C. this
D. which
2. When he was working there he caught a serious ilness from_efforts he still suffers.
A. which
B. that
C. whose
D. what
3. It's said that he's looking for a new job, one _he can get more money to support his family.
A. when
B. where
C. that
D. which
4. I can think of many cases _students obviously knew a lot of English words and expressions but couldn't write a good essay.
A. why
B. which
C. as
D. where
5. He's got himself into a dangerous situation_he is likely to lose control over the plane.
A. where
B. which
C. while
D. why
6. He made another wonderful discovery,_of great importance to science.
A. which I think is
B. which I think it is .
C. which I thinkit
D. I think is
答案解析:
1. D。which 指the road map。
2. C。from whose efforts he still suffers为修饰a serious ilness的定语从句，whose 在定语从句中用作定语，修饰efforts.
3.B. where引导定语从句修饰one。往: one 在此指anewjob.类似地，下面一题的答案是C， 因为one that相当于a problem that: The problem is.has caused us a 1lot of trouble. A. one B. that C. one thatD.that one
4.D。先行词是many cases，关系副词where =in which。
5. A。where 所引导的为修饰a dangerous situation 的定语从句。
6.A。选项中的Ithink是插入语，若略去不看便可清楚地看出答案。
