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

解答 答案D. have/has been doing 是現(xiàn)在完成時,表示過去發(fā)生的動作一直持續(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 是定語從句,修飾a role;since引導時間狀語,說明自從她嫁給父親就可是承擔的角色,一直持續(xù)到現(xiàn)在,故用現(xiàn)在完成時.選D.

點評 本題是基礎題,考查時態(tài)的運用,要熟悉各個時態(tài)的用法并結(jié)合具體的語境選擇出正確選項.

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