There are some health problems that , when _______ in time , can become bigger ones later on.
A．not treatedB．not having treated
C．not to be treatedD．not having been treated
A

試題分析: 考查非謂語動(dòng)詞。從句子結(jié)構(gòu)可知?jiǎng)釉~treat和邏輯主語health problems之間是被動(dòng)關(guān)系，而且是指普遍性情況，所以答案選A。句意：有一些健康問題，當(dāng)不被及時(shí)治療時(shí)，以后可能會成為大問題。
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