________youhaveunderstoodit，Idon'thavetoexplainit.A．Byn...

问题详情：

________you have understood it，I don't have to explain it.

A．By now                B．Now that

C．Now this               D．Right now

【回答】

B　[by now直到现在；now that既然；right now现在，立刻。根据句意应选B。]

知识点：连词

题型：选择题