Question

When the old man saw some litter on the ground, he quickly          .

A．picked it up

B．picked up it

C．picked them up

D．picked up them.

Answer 1

A

本题的含义是当老人看到地上的垃圾，他会很快地把它们捡起来，pick up sth为此意，sth为代词，应放在pick和up之间，垃圾为不可数名词用it，故本题选A。