题目内容
____________ Davy called me, I was sleeping.
| A．Until | B．When |
| C．While | D．Because |
B
解析试题分析：句意：当Davy给我打电话的时候，我正在睡觉。A知道 B当……时候 C当……时候（后接进行时）D因为；根据题意，是时间状语从句，因为从句部分是一般过去时。所以不能用while。故选B.
考点：考查连词的用法。
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