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    If _______, these injuries can develop into more serious problems.

    A．left untreatingB．left untreated
    C．leaving untreatedD．are left untreated

    B

    解析试题分析：考查省略句，当主从句的主语一致的时候，可以省略从句的主语和be动词，这句话省略的就是后面的主语these injuries和are，完整的说是If these injuries are left untreated, these injuries can develop into more serious problems.这里的leave...+adj/adv/prep 表示使。。。处于某种状态。译为：如果被这些伤口不处理可能会发展成更严重的问题。
    考点：考查从句的省略式
    点评：做这种题目可以用还原法做题，先把主语和be动词加上，再判断是主动还是被动。句意通顺才行。

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