题目内容
______ he got ready to leave home, his parents came to his home.
| A．While | B．As | C．Until | D．If |
B
解析试题分析：句意：正当他准备离家的时候，他父母到了他的家。 As表示正当一个动作发生的时候，另一个动作也发生了。故选B。
考点：考查连词的用法。
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