【題目】—What do you usually do ________ your parents aren't at home?
—I do my homework. Sometimes I watch TV or play computer games.
A.because
B.while
C.but
D.before

【答案】B
【解析】本題考查while引導(dǎo)的時間狀語從句，句意：—當你父母不在家時，你通常做什么？—我做作業(yè)。有時候看電視或玩電腦游戲。A項because引導(dǎo)原因狀語從句，含義為“因為，由于”，B項引導(dǎo)時間狀語從句，含義為“當…時候”，C項but為并列連詞，含義為“但是”，D項before引導(dǎo)時間狀語從句，含義為“在…之前”。根據(jù)題意，B項正確。

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