Although medical science________control over several dangerous diseases，what worries us is that some of them are recurrent.

A．a(chǎn)chieved B．has achieved

C．will achieve D．had achieved

 

B

【解析】答案　B　[句意：盡管醫(yī)學(xué)已經(jīng)成功地控制了一些危險的疾病，但令我們擔(dān)心的是，其中有些疾病還會反復(fù)發(fā)作。根據(jù)句意可知說話者談?wù)摰氖菑倪^去延續(xù)到現(xiàn)在的情況，故用現(xiàn)在完成時態(tài)。]

 

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