因为这里需要强调过去发生的事对现在造成的影响（即：看上去很担忧）
所以使用现在完成时,
选择A have lost
— They look worried.What's wrong with them?— It seems that they something important.
— They look worried.What's wrong with them?— It seems that they something important.
A．have lost
B．lost
C．had lost
D．lose
为什么选a不选b
A．have lost
B．lost
C．had lost
D．lose
为什么选a不选b
英语人气：417 ℃时间：2019-09-05 00:55:12
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