My patients if______ the opportunity would freely converse about their problems whilst _
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My patients, if______ the opportunity, would freely converse about their problems whilst ______ in my waiting room.
A．giving, sitting
B．giving, sat
C．given, sat
D．given, sitting
请帮忙给出正确答案和分析，谢谢！
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正确答案：D
省略用法题。状语从句如果从句主语和主句主语相同则可省略主语和系动词，本题ifgiventheopportunity=iftheyweregiventheopportunity，而whilstsitting=whilsttheyweresitting，故D正确。