My mother and Olga had met while underwent fertility treatments at some sort
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单选题My mother and Olga had met while underwent fertility treatments at some sort of experimental program in one of the Moscow clinics.
A.while undergoing
B.when were undergoing
C.during the time they underwent
D.while they underwent
参考答案：A
答案解析：时间状语从句中的省略用法。在书面语中，当时间或条件状语从句的主语 与主句的主语一致时，从句中的主语和助动词可以省略，使表达更简洁。
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