What they are talking about at the meeting __________ important.A.are B.is C.very D.are going

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What they are talking about at the meeting __________ important.A.are B.is C.very D.are going

What they are talking about at the meeting __________ important.A.are B.is C.very D.are going
What they are talking about at the meeting __________ important.
A.are B.is C.very D.are going

What they are talking about at the meeting __________ important.A.are B.is C.very D.are going
B
What they are talking about是一个名词性主语,应该用单数形式

B

is
前面的What they are talking about at the meeting 做主语
important做宾语

B
...
这个是名词性从句里的主语从句吧