3.—Serina has been watching the TV series the whole night—________A So have her parents B So have been her parents选a为啥不选b?

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3.—Serina has been watching the TV series the whole night
—________
A So have her parents B So have been her parents
选a为啥不选b?

我也是这样有三中表达方式:
so do I
so am I
so have I
这是固定用法.
如果还有动词是可以省去的.

第一题应该选A,这里的must have been,表示肯定的猜测,而不是现在完成时3.—Serina has been watching the TV series the whole night. —____