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The doctor did what he could ____ the dying man .A.save B.to save C.saved D.saving为什么选B,请详解,

题目详情
The doctor did what he could ____ the dying man .
A.save B.to save C.saved D.saving
为什么选B,请详解,
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答案和解析
The doctor did what he could ____ the dying man
.A.save B.to save C.saved D.saving
为什么选B,请详解,
因为
The doctor did what he could to save the dying man =The doctor did what he could do to save the dying man
因为句中有do,为了避免重复,所以,省略了do.