Many college graduates are willing to start online shops to get over the period they have

问题补充：

Many college graduates are willing to start online shops to get over the period they have difficulty finding a satisfactory job.

A. where

B. when

C. which

D. that

答案：

A. where

(答案→)B. when

C. which

D. that

解析：考查定语从句。先行词为the period，在定语从句中作时间状语，故用关系词when，选B。