Isn’t it time you got down to ___ the papers?
A．mark
B．be marked
C．being marked
D．marking
D
正確答案為D�？忌渍`以為考查動(dòng)詞不定式結(jié)構(gòu)而選A。其實(shí)本題考查短語(yǔ)get down to doing sth的用法，意思是開(kāi)始認(rèn)真對(duì)待某事。
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