As a single mother of three children she has very little time she can spare to develop he

问题补充：

As a single mother of three children, she has very little time she can spare to develop her own interest.

A. when

B. that

C. which

D. what

答案：

A. when

(答案→)B. that

C. which

D. what

解析：B 考察定语从句。从句中spare缺少宾语，所以使用关系代词，先行词被little修饰，所以不使用which而选that。故B正确。