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　　A. has lost, don't find　　 B. is missing, don't find　C. has lost, haven't found　 D. is missing, haven't found.

　　答案D. 前句是一个仍在持续的状态，应用进行时，由于没有找到，其影响仍然存在，应用完成时，瞬间动词用于否定式时可用于完成时。

　　不用进行时的动词

　　1) 事实状态的动词

　　have, belong, possess, cost, owe, exist, include, contain, matter, weigh, measure, continue

　　I have two brothers.

　　This house belongs to my sister.

　　2) 心理状态的动词

　　Know, realize, think see, believe, suppose, imagine, agree, recognize, remember, want, need, forget, prefer, mean, understand, love, hate

　　I need your help.

　　He loves her very much.

　　3 ) 瞬间动词

　　accept, receive, complete, finish, give, allow, decide, refuse.

　　I accept your advice.

　　4) 系动词

　　seem, remain, lie, see, hear, smell, feel, taste, get, become, turn

　　You seem a little tired.

　　(一) 、单选

　　1、 Look! He _____their mother do the housework.

　　A. is helping B. are help C. is help D.is helpping

　　2 、_____are the boys doing ? They are singing in the room.

　　A .Who B .How C.What D.Where

　　3、 Don’t talk here. My mother _____.

　　A. is sleeping B .are sleeping C. sleeping D .sleep

　　4 、Danny ______. Don’t call him.

　　A. is writeing B .is writing C.writing D .writes

　　5 、–When_____he_____back?

　　– Sorry, I don’t know.

　　A. does,come B.are coming C.is come D.is coming

　　答案：A C A B D

　　(二)、填空

　　1、 It’s ten o’clock. My mother _____(lie)in bed.

　　2、 What____he _____(mend)?

　　3、 We _____(play)games now.

　　4、 What ____you____(do) these days?

　　5、 ____he ___(clean) the classroom?

　　6、 Who____(sing)in the next room?

　　7 、The girl____(like)wearing a sweater. Look! She ____(wear)a red sweater today.