Did you see Mr Brown at the party yesterday evening?No,__for half an hour when l got there.A.I cannotB.he had leftC.he has leftD.he would be away讲解.

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Did you see Mr Brown at the party yesterday evening?No,__for half an hour when l got there.A.I cannotB.he had leftC.he has leftD.he would be away讲解.

Did you see Mr Brown at the party yesterday evening?No,__for half an hour when l got there.A.I cannotB.he had leftC.he has leftD.he would be away讲解.
Did you see Mr Brown at the party yesterday evening?
No,__for half an hour when l got there.
A.I cannot
B.he had left
C.he has left
D.he would be away
讲解.

Did you see Mr Brown at the party yesterday evening?No,__for half an hour when l got there.A.I cannotB.he had leftC.he has leftD.he would be away讲解.
B
此句很明显要用过去进完成时
因为我去的时刻已经是过去时
而他走时在我去之前
应是过去的过去
所以要用过去完成时