问题
选择题
_____ each other, the twin sisters are difficult to distinguish. [ ]
A. To look like
B. Looking like
C. Looked like
D. Look like
答案
答案：B
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_____ each other, the twin sisters are difficult to distinguish. [ ]
A. To look like
B. Looking like
C. Looked like
D. Look like
答案：B
。已知1,3－丁二烯与少量溴水加成时有以下两种方式：