We went to the West Lake yesterday, ___, not surprisingly, was crowded with visitors from all over t

题干

We went to the West Lake yesterday, ___, not surprisingly, was crowded with visitors from all over the world．

A：where

B：which

C：that

D：whe

上一题下一题 0.0难度选择题更新时间:2016-11-09 06:26:42

已知：

①E的相对分子质量为138

②F的相对分子质量为240

③通常在同一个碳原子上连有两个羟基不稳定，容易脱水形成羰基

④RCHO+R′CH₂CHO $\overset{稀 N a O H}{\to}$ H₂O+

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