Question

He ________ get into his house last night because he lost his key．

1. A.
   can't
2. B.
   could
3. C.
   couldn't
4. D.
   can

Answer 1

C
解析：
last night是表示過去的時間狀語，常用于一般過去時。“丟了鑰匙”，因此“不能進門”。