20．Mother wanted to be a good provider，a role she          since her marriage to Father．（　�。�
A．shouldersB．shouldered
C．is shoulderingD．has been shouldering

分析 句意：母親想要成為一個(gè)很好的養(yǎng)家著，一個(gè)自從他嫁給父親一直肩負(fù)的角色．

解答 答案D． have/has been doing 是現(xiàn)在完成時(shí)，表示過(guò)去發(fā)生的動(dòng)作一直持續(xù)到現(xiàn)在，可能剛剛結(jié)束，也可能繼續(xù)持續(xù)下去．根據(jù)句意，she ____since her marriage to father 是定語(yǔ)從句，修飾a role；since引導(dǎo)時(shí)間狀語(yǔ)，說(shuō)明自從她嫁給父親就可是承擔(dān)的角色，一直持續(xù)到現(xiàn)在，故用現(xiàn)在完成時(shí)．選D．

點(diǎn)評(píng) 本題是基礎(chǔ)題，考查時(shí)態(tài)的運(yùn)用，要熟悉各個(gè)時(shí)態(tài)的用法并結(jié)合具體的語(yǔ)境選擇出正確選項(xiàng)．

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