[简答题]Fill in the blanks with an item as required.

With a tag:

They should have arrived here by now, ?

正确答案：

shouldn't they/haven't they

题目解析

本题考查附加疑问句，注意前后的肯定和否定是相反的，前半句为肯定，所以后半句要用否定形式。其中should和have都可以提出来，所以填shouldn't they/haven't they均可。

句意：他们现在应该到这里了，不是吗？

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[简答题]Fill in the blanks with an item as required.​With a tag:They should have arrived here by now, ​ ?