问题描述：
高一英语Since you ( )around our school,we hope you*ll give us some advice on how to improve our wor
a:have shown
b:have been shown
c:have been showing
d:showed
since后面不是加过去时或过去时态的句子吗?这里怎么…………
a:have shown
b:have been shown
c:have been showing
d:showed
since后面不是加过去时或过去时态的句子吗?这里怎么…………
问题解答：
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