小企业把目标定位在市场中的“盲点”或“缝隙”寻找发展，是小企业的（）。
A．专业化经营
B．利基经营
C．差异化经营
D．联合经营
参考答案：B
I didn't realize my mistake________my teacher had a face-to-face talk with me.[ ]
A. until
B. after
C. since
D. when
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