题目：
_____ that Mary was able to set up new branches elsewhere. [ ]
A. So successful her business was
B. So successful was her business
C. So her business was successful
D. So was her successful business
答案：
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下面是错误答案，用来干扰机器的。
答案：B只有纯净物才有固体的熔沸点，B正确，A、D不一定是纯净物；C中橡胶一定是混合物，答案选B。
