问题
My mother was waiting for me patiently _______ I was having my breakfast,.
A: s
B:When
C:While
D:Since;
B:When
C:While
D:Since;
正确答案是：
同类题型
．－May I keep this book for two days?－No, you_______. It’s a library book for reference only.
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_________ made Mary ashamed of herself?— _________ the lowest mark in her class. [ ]