问题
选择题
When ____ about the source of his income, he hesitated for a moment, obviously not willing to give us a direct answer.
A．asked
B．asking
C．being asked
D．having asked
答案
答案：A
考查状语从句的省略。当从句主语与主句主语一致，并且从句主语后动词为be动词时，可以省略从句的主语与be动词。此题从句省略了he was.