Some social workers _____ after the people in need while others ____ out food to the local people.

A．looked, gave
B．were looking, gave
C．were looking, were giving
D．looked, were giving

C

解析試題分析：根據(jù)語境可知此句的含義是一些社會工作者照顧有需要的人，而其他人提供食物給當?shù)厝嗣袢罕�。此題重點考查的是while引導的狀語從句表示當…的時候。其強調(diào)的是兩個動作同時進行，并且經(jīng)常用進行時態(tài)，故選C。
考點：過去進行時的用法。
點評：when，while都有“當……時候”的意思。when既可表示某一點時間，也可以表示某一段時間 。在when引導的時間狀語從句中，其謂語動詞可以是延續(xù)性的，也可以是非延續(xù)性的，可與主句中的謂語動詞同時發(fā)生，也可在其后發(fā)生。while只能表示某一段時間，不能表示某一點時間。在while引導的時間狀語從句中，其謂語動詞只能是延續(xù)性的，而且也只能與主句中的謂語動詞同時發(fā)生或存在。如主句謂語動詞表示的是短暫動作，從句時間狀語指一段時間，when while 可通用。
while引導的時間狀語從句多用進行時態(tài)，而when引導的時間狀語從句多用一般時態(tài)。
while 和 when在過去進行時中的用法：表示兩個持續(xù)性的動作在過去同時發(fā)生用while，when后接一個短暫性的動作。持續(xù)性的動作用過去進行時,自然也就是要+ing了，短暫性的動作用一般過去時,所以不+ing.所以是while后的動作+ing,when后的動作一般不+ing

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