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Shortly after we ____,a waiter came over to our tablewith a

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Shortly after we ____,a waiter came over to our tablewith a smile.
A.seated
B.are seated
C.sat ourselves
D.took places 为什么不选A
seat 的用法:
1、seat sb =sb be seated
2、seat oneself
只有这两种用法
简单说后面没有 sb/oneself 就用seated
再问: 为什么要加be动词
再答: 只有seat sb ,如果sb 放前面是被动,要加be动词