______ he got ready to leave home, his parents came to his home.
A．WhileB．AsC．UntilD．If
B

試題分析：句意:正當(dāng)他打算離開家時(shí)，他的父母來到了他的家。while 當(dāng)…時(shí)候，引導(dǎo)時(shí)間狀語從句；as 當(dāng)…時(shí)候，表示兩個(gè)動(dòng)作同時(shí)發(fā)生；until 直到…時(shí)候；if 如果，引導(dǎo)條件狀語從句。根據(jù)句意可知選B。
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