Question

Experiments of this kind _______in both the U.S. and Europe well before the Second World War started.

A．have conducted	B．have been conducted
C．had conducted	D．had been conducted

Answer 1

D

試題分析：句意：在第二次世界大戰(zhàn)之前這種實(shí)驗(yàn)就在美國和歐洲做過。因?yàn)闀r(shí)間狀語before the Second World War started.這里的謂語動(dòng)詞是過去式，conduct是在這個(gè)動(dòng)作之前的發(fā)生的動(dòng)作，故用過去完成時(shí)，又因?yàn)閑xperiments與conduct之間是被動(dòng)關(guān)系，故選D。
點(diǎn)評：本題難度適中。動(dòng)詞的時(shí)態(tài)及語態(tài)放在一起考查增加了試題的難度，需要考生有分析理解復(fù)雜的句子結(jié)構(gòu)的能力。
即學(xué)即練：In the last few years thousands of films_______ all over the world.
A.have produced   B. have been produced   C. are producing      D. are being produced
解析：B。句意：“在過去的幾年時(shí)間里，全世界制作了成千上萬部電影�！眎n the last few years在過去的幾年時(shí)間里，其實(shí)是從過去算到現(xiàn)在，是現(xiàn)在完成時(shí)的標(biāo)志。選B。