have disappeared
首先这句话的意思是羊儿们从上周起一个接一个的消失了
所以句首的sheep应该是负数,排除第一个答案
其次since last week是现在完成时的特征词,所以排除三四,因为他们是现在进行时和一般现在时
The sheep（ ）one after another since last week.
3个回答
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