问题
选择题
The temperature can fall to －50°C. _____ is, 50°Cbelow freezing point.
A. Which B. It C. This D. That
答案
答案：D
选D。 That is =" That" is to say 换句话说，也就是说。
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The temperature can fall to －50°C. _____ is, 50°Cbelow freezing point.
A. Which B. It C. This D. That
答案：D
选D。 That is =" That" is to say 换句话说，也就是说。