单选题
—Is it his left kidney (肾) ______ Tian Shiguo donated (捐献) to his mother? — Yes. The kidney saved his mother and is expected to extend her life for 15 years.
【正确答案】
B
【答案解析】[考点] 强调句 [解析] 强调句的结构为：It is…that…。本题为强调句的一般疑问句形式。句中强调的是his left kidney。故答案为B。