—You should have thanked the hostess before leaving. —I meant ______. But I couldn’t find her when I was leaving.A.toB.to doC.doingD.doing so
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A解析这题考察不定式的省略式，完整的说法是：I meant to thank the hostess before leaving。因为上文已有了动词，下文就要省略，保留to。句意是：--你本应该离开前感谢女主人的，--我本来打算的，但我离开时找不到她。选A。