If _______, these injuries can develop into more serious problems.
A．left untreatingB．left untreated
C．leaving untreatedD．a(chǎn)re left untreated
B

試題分析：考查省略句，當(dāng)主從句的主語一致的時(shí)候，可以省略從句的主語和be動(dòng)詞，這句話省略的就是后面的主語these injuries和are，完整的說是If these injuries are left untreated, these injuries can develop into more serious problems.這里的leave...+adj/adv/prep 表示使。。。處于某種狀態(tài)。譯為：如果被這些傷口不處理可能會(huì)發(fā)展成更嚴(yán)重的問題。
點(diǎn)評(píng)：做這種題目可以用還原法做題，先把主語和be動(dòng)詞加上，再判斷是主動(dòng)還是被動(dòng)。句意通順才行。
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