题目内容
Li Ping was watching TV ________ there was a loud knock on the door.
[ ]
A.when
B.while
C.if
D.because
答案:A
解析:
解析:
when表示就在这时. |

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题目内容
Li Ping was watching TV ________ there was a loud knock on the door.
A.when
B.while
C.if
D.because
when表示就在这时. |