【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(shí)間狀語(yǔ)從句，句意：—當(dāng)你父母不在家時(shí)，你通常做什么？—我做作業(yè)。有時(shí)候看電視或玩電腦游戲。A項(xiàng)because引導(dǎo)原因狀語(yǔ)從句，含義為“因?yàn)椋捎凇�，B項(xiàng)引導(dǎo)時(shí)間狀語(yǔ)從句，含義為“當(dāng)…時(shí)候”，C項(xiàng)but為并列連詞，含義為“但是”，D項(xiàng)before引導(dǎo)時(shí)間狀語(yǔ)從句，含義為“在…之前”。根據(jù)題意，B項(xiàng)正確。

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