When______at the door, she was given a warm welcome.A、appearsB、appearingC、to a

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问题 When______at the door, she was given a warm welcome.

选项 A、appears
B、appearing
C、to appear
D、appeared

答案 B

解析本题考查非谓语形式。现在分词作状语，表示时间，前面加when／while／until等连词可放在句首或句末。此句主句主语为she，she与选项中动词appear的关系是主动关系，故appear应用现在分词形式，故本题选B。

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When______atthedoor,shewasgivenawarmwelcome.A、appearsB、appearingC、toa