下列说法不正确的是[ ]
A．酱油不是油
B．糖精不是糖
C．黄酒不是酒
D．纯碱不是碱
答案：C
---Did you wait for him long?
---No, I hadn’t waited long _______ he appeared.
A．unless
B．until
C．before
D．since
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