The city was difficult ________, _________ was defended by an army of 6,000 men.A.to be taken; whichB.to take; thatC.to take; whichD.to be taken; that
网友回答
C解析 The city was difficult to take = It was difficult to take the city. 只要这两种句型能够互换，不定式就得用主动的形式。