My mother goes shopping,______I must look after my little brother.
A．soB．becauseC．a(chǎn)ndD．but
A

試題分析：because 是從屬連詞，接表示直接原因的從句，一般放在主句的后面，也可放在主句前面，它表示的語氣最強，在回答why的問句時，必須用because。as 是從屬連詞，說明一般的因果關(guān)系，語氣比because弱，說明比較明顯的原因，它引導(dǎo)的從句通常放在句首，有時也可放在句末。And是和的意思，表示并列或順承；but表示轉(zhuǎn)折，根據(jù)語境可知選擇A.
點評：because只能放在句子中間,在它之前的是結(jié)果,后面的是原因. so做所以解釋時也是放在句子中間,在它之前的是原因,后面的是結(jié)果.
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