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

試題分析：考查時態(tài)：句意：雖然醫(yī)學(xué)科學(xué)已經(jīng)控制了幾個危險的疾病，讓我們擔(dān)心的是一些又回來了。從第二句話用的進行時，可知前面是已經(jīng)控制了，用現(xiàn)在完成時。選B。
點評：時態(tài)的考查結(jié)合上下文找到動作發(fā)生的時間就好做了。如果沒有具體的時間，就考慮句子提供的語境，利用一切可以利用的信息。
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