Mymotherisout,soIhaveto     myyoungsisterathome.A.look...

問題詳情：

 My mother is out, so I have to      my young sister at home.

A. look at             B. look after  C. look for    D. look over

【回答】

B

知識點：動詞和動詞短語

題型：選擇題