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选哪个.We must keep the door---while----PE class on the playgro

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选哪个.
We must keep the door---while----PE class on the playground.A.locked;havingB.closed ,haveC.opening;havingD.locking;having
选哪个.We must keep the door---while----PE class on the playgro
选 A
keep the door locked这里要用过去分词,因为门是被锁的,表示被动,用过去分词
while (we are) having PE class on the playground.这里的we are可以省略,省略的条件一：从句的主语与主句的主语相同（此处主语都为we）.条件二：从句的谓语动词中含有be,可以把从句的主语和be动词一起省略.
we must keep the ( )on the road we must keep the( ) on the road When we were in middle school, we ___football on the playgro we must keep on learning if we want to keep up with the ( ) we would better keep the door closed You must keep the door----------in the day .(close) You must keep the door closed .( 改为同义句) We must stop（ ） the litter on the beach to keep it clean. we must keep the balance of ( ).(自然界) we must keep( ) in the hospital We must ___(keep) the classroom clean. We must keep the window______(open).