What four and five?nine.A.are TWhat four and five?nine.A.are They are B.is It's C.is Its D.are It's还有为什么.

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What four and five?nine.A.are T
What four and five?nine.
A.are They are B.is It's C.is Its D.are It's
还有为什么.

b 前一空 and表示加作为一个整体了 所以单数 后一空 回答是数字也作单数 不知道解释的好吗