When______at the door, she was given a warm welcome.

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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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