Although medical science __________ control over several diseases,what worries us is that some of them are returning.
A．a(chǎn)chievedB．has achievedC．will achieveD．had achieved
B

試題分析：句意：雖然醫(yī)療科學(xué)已經(jīng)控制了幾種疾病，我們擔(dān)心的是有些還會回來。從what worries us is that some of them are returning.可知現(xiàn)在強(qiáng)調(diào)的是現(xiàn)在的結(jié)果，所以用現(xiàn)在完成時，選B.
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