Thesoldierstriedtheirbestanddidwh

发布时间：2020-07-27 03:30:20

The soldiers tried their best and did what they could _______ against the flood．A.fightB.to fightC.fightingD.fought

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B解析could后面省略了实义动词do；what they could(do)作前面动词did的宾语, 故后面用不定式作目的状语。
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