When she arrived, I felt a little angry, because I () since seven oclock.

科目名称：理工英语4

试卷号：10861

题型：词汇与结构(单选题)

题目：When she arrived, I felt a little angry, because I () since seven oclock.

选项：A.had been waiting B.did I know C.provided D.effect

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答案：A.had been waiting