A.
这里could表示委婉的语气,并不表示过去式,因此选择A.
B中had left 没有使用过去完成时的道理,C would应该是will,D没有这种说法.
1、Could you make sure---------- ? A 、when the train leaves B、if the train had left C······
1、Could you make sure---------- ? A 、when the train leaves B、if the train had left C······
1、Could you make sure?
A 、whenthetrainleavesB、ifthetrainhadleft
C、whenthetrainwouldleaveD、wherehasthebusgone
1、Could you make sure?
A 、whenthetrainleavesB、ifthetrainhadleft
C、whenthetrainwouldleaveD、wherehasthebusgone
英语人气：652 ℃时间：2019-11-13 02:48:30
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