高一英语，关于定语从句的题目

Question

1.He has got himself into a dangerous situation ( )he is likely to lose control over the plane.
A.where B.which C.while D.when

2.Occasions are quite rare( ) I have the time to spend a day with my kids.
A.who B.which C.why D.when

3.After graduation she reached a point in her career () she had to decide what to do.
A.that B.what C.which D.where
最好能有解释啊，谢谢

Answer 1

1.A
where引导定语从句，修饰先行词situation,在从句中做状语。因为从句中the plane做介词over的宾语，所以从句不缺宾语，排除B.

2.D
when引导定语从句，修饰先行词occasions。从句中不缺主语或宾语，排除AB.

3.D
where引导定语从句，修饰先行词point,从句中what to do是疑问词加上不定式的结构，what和do构成动宾关系，所以也不缺宾语，只能选择关系副词。

Answer 2

1. B.which 作补语
2. D.when Occasions 是关于时间的，所以用when
3. A.that 引起定语从句，修饰point

Answer 3

1.A 先行词是situation,定语从句中缺少地点状语。所以我们用关系副词where，另外捡到先行词是situation时，定语从句缺少状语一般都是用where引导定语从句。
2.D 先行词是occasion，定语从句缺少时间状语用when来引导。
3.D.定语从句缺少地点状语，定语从句修饰限定的point