Hisfatheroftencomesbackfromworkat10o’clockatnight,

問題詳情：

 His father often comes back from work at 10 o’clock at night, _______ his mother is still waiting for him.

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

【回答】

B

知識點：定語從句

題型：選擇題