______ he got ready to leave home, his parents came to his home.

A．WhileB．AsC．UntilD．If

B

解析試題分析：句意：正當(dāng)他準(zhǔn)備離家的時(shí)候，他父母到了他的家。 As表示正當(dāng)一個(gè)動(dòng)作發(fā)生的時(shí)候，另一個(gè)動(dòng)作也發(fā)生了。故選B。
考點(diǎn)：考查連詞的用法。

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