问题补充:
单选题Thoughthisquestionisverydifficult,ifyou________tryingyouwillfindtherightanswer.A.keep upB.keep onC.keep outD.keep off
答案:
B解析这题考查词组辨析: keep on“继续,反复做”,符合题意。keep up“保持,跟上”;keep out“使留在外面,扣留”;keep off“使不接近,避开某话题”。句意:尽管这个问题很难,但是如果你继续不断地尝试,你会得到正确