问题补充：
The soldiers tried their best and did what they could against the flood.
A. fight
B. to fight
C. fighting
D. fought
答案：
A. fight
(答案→)B. to fight
C. fighting
D. fought
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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