Question

Lots of waste has been dumped into the river，which has led to________.

A．lots of fish having been killed	B．kill lots of fish
C．lots of fish being killed	D．lots of fish to kill

Answer 1

C

試題分析：句意：大量的廢物被倒入河中，大致了大量的魚(yú)類死亡。Lead to導(dǎo)致，to為介詞，介詞后要接名詞或動(dòng)名詞，因此排除B&D；而A是過(guò)去分詞的完成時(shí)形式，完成時(shí)強(qiáng)調(diào)動(dòng)作發(fā)生在主句動(dòng)作之前，而題目里從句的動(dòng)作（魚(yú)被殺死）應(yīng)該是在主句動(dòng)作（垃圾被倒入河里）之后，所以A錯(cuò)誤；故答案選C。
點(diǎn)評(píng)：本題較難。要做出本題必須明白兩個(gè)用法，一是to介詞后要跟什么詞來(lái)作它的賓語(yǔ)；而要明白having done所表示的時(shí)間，明白了這兩個(gè)用法，問(wèn)題就很簡(jiǎn)單了。
即學(xué)即練：I’d appreciate it if you could come and help me once more and I am always thankful for ___________ me with my English in the past.
A. you to help   B. yours helping   C. you having help   D. your helping