We ( ) cotton when they arrived.A.were pickingB.would pickC.are pickingD.have picked

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We ( ) cotton when they arrived.A.were pickingB.would pickC.are pickingD.have picked

We ( ) cotton when they arrived.A.were pickingB.would pickC.are pickingD.have picked
We ( ) cotton when they arrived.
A.were picking
B.would pick
C.are picking
D.have picked

We ( ) cotton when they arrived.A.were pickingB.would pickC.are pickingD.have picked
A.首先arrived表明是过去式,when这里表示同时进行两件事,所以动词用ing形式.意思为当我们正在看卡通片的时候他回来了.强调我们正在做的那个动作

A
后半句给出了整句的时间,根据时态应该用过去进行式

A