根據(jù)題意,用題后括號(hào)中正確的連詞填空:

Miss Li didn't come to work yesterday ________ she had to stay home to look after her sick mother.(because, as, since, for)

答案:because
解析:

  解析:本例主要考查表示各種理由的連詞的區(qū)別。because是從屬連詞,它引導(dǎo)的原因狀語(yǔ)從句表示直接的或明確的原因或理由,語(yǔ)氣較強(qiáng),如不說(shuō),則不為人們所知。because從句多位于主句之后。如:Why am I leaving? I'm leaving because I want to. as和since也是從屬連詞。引導(dǎo)的原因狀語(yǔ)從句語(yǔ)氣較because弱,意為“由于”、“既然”,表示已為人們所知或顯而易見(jiàn)的原因或理由。as從句和since從句多位于主句前。如:Since everyone is here. Let's begin our meeting. for是并列連詞,引導(dǎo)一個(gè)并列句,它不用于句首,而用于主句之后,補(bǔ)充說(shuō)明理由;主句表推測(cè)時(shí),用for說(shuō)明理由。如:It must have rained last night, for the road is wet.此題從句表示的是直接的原因,它所敘述的理由是本句的重點(diǎn)。

  拓展延伸:注意區(qū)分意義相近連詞的用法,做到舉一反三。


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