We spent half a year in building the park.(改为同义句) It___ __ half a year ___ ___ the park.

是这样的：We spent half a year in building the park 这个句子里中用了句型：sbspendsometime(in) doingsth. 这个句型的同义句是：it take sb some time to do sth 花费某人多少时间去做某事.it是形式主语；其真正主语是动词不定式“to do sth”.所以应该是：It took us half a year to build the park
祝学习进步哦~