【題目】This team has ________ (spend) about five years designing this app and they won't allow themselves to fail.

【答案】spent

【解析】

句意為：這個(gè)團(tuán)隊(duì)已經(jīng)花費(fèi)了大約五年設(shè)計(jì)這個(gè)程序，他們不允許他們自己失敗。分析句子結(jié)構(gòu)可知此處為現(xiàn)在完成時(shí)，故填spent。

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