we'll insist on doing it ( )difficult it may be

问题描述:

we'll insist on doing it ( )difficult it may be
A no matter howB whatever为什么选A

这是一句让步状语从句,意思是无论多难,我们都会坚持做的.
正确语序是:no matter how + 形容词/副词+主语+谓语.
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