Although medical science________ control over several dangerous diseases, what worries us is that some of them are returning.?

A．a(chǎn)chieved                              B．has achieved

C．will achieve                            D．had achieved

 

【答案】

B

【解析】

試題分析：考查時(shí)態(tài)：句意：雖然醫(yī)學(xué)科學(xué)已經(jīng)控制了幾個(gè)危險(xiǎn)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(jìn)行時(shí)，可知前面是已經(jīng)控制了，用現(xiàn)在完成時(shí)。選B。

考點(diǎn)：考查時(shí)態(tài)

點(diǎn)評(píng)：時(shí)態(tài)的考查結(jié)合上下文找到動(dòng)作發(fā)生的時(shí)間就好做了。如果沒有具體的時(shí)間，就考慮句子提供的語(yǔ)境，利用一切可以利用的信息。

 

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