题目内容
Is it his left kidney（肾）____________ Tian Shi-guo donated（捐献）to his mother?Yes. The kidney saved his mother and is expected to extend her life for 15 years.
A. which B. that C. what D. where
答案：B
解析：
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解析：
| 本题考查的是强调句it is…that。
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