Tā / zì / shǐ / jiù / qīng / chǔ / zhè / xiàng / rèn / wù / de / nán / dù / què / méi / yǒu / xuǎn / zé / fàng / qì

他自始就清楚这项任务的难度，却没有选择放弃。

He understood the difficulty of the task from the outset but chose not to give up.