----Was that Mr Zhang who walked by?----_____.must have been.为什么be动词后面不接东西呢?为什么It must be that.不行?

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----Was that Mr Zhang who walked by?
----_____.
must have been.
为什么be动词后面不接东西呢?
为什么It must be that.不行?

即使接也要接 It must have been him.
问:刚刚走过的是张先生吗?
答:应该是(他).

为什么接