题目内容
I ________ to have supper ________ he returned.A．was just about; when
B．am about; when
C．was about; while
D．was going; while
答案：A
解析：
提示：
解析：
| 首先判断时态，从句时态为过去时，主句时态要一致，排除B。while后面的谓语动词必须是延续性的，所以只能用when。选择A。
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