9.There are some health problems that, when _C___in time, can become bagger ones later on.
A.not treated B,not being treated C.not to be treated D.not having been treated


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祝學(xué)習(xí)進步其實答案是A我是覺得后面有個later on；所以應(yīng)該有將來的意思；所以用了to be treated但真的是A。。。狀語從句省略主+BE,=when they are nottreadted...譯：有一些如不及時治療以后會變得更糟糕的健康問題。評：將when改成if是不是更好些。析：如果用not being treated, 則還原成：when they are not being treated...是正在進行的被動語態(tài)，不當(dāng)。When not having been treated =when they are not having been treated ..., 沒有這樣的時態(tài)語態(tài)結(jié)構(gòu)。注：when有時有“在。。。的情況下”的意思，相當(dāng)于，if,也可以譯作如果