第16題 Many countries face some serious problems of land use, __ result from population growth and the demands of modem technological living.

　　A.which most

　　B.most of which

　　C.most which

　　D.of most which

　　【正確答案】：B

　　試題解析：這是由which引導(dǎo)的非限制性定語從句。

　　第17題 Our boss told me my plan was still __ discussion.

　　A.in

　　B. under

　　C. of

　　D. with

　　【正確答案】：B

　　試題解析：under discussion表示“在討論中”，類似的還有under consideration(在考慮中)等。

　　第18題 Tom looks so pale today.He __ ill.

　　A.must be

　　B.had to be

　　C.should be

　　D.shall be

　　【正確答案】：A

　　試題解析：情態(tài)動詞must表示推測。

　　第19題 He said he __ the next day.

　　A.will come back

　　B.come back

　　C.would come back

　　D.came back

　　【正確答案】：C

　　試題解析：主句謂語動詞是過去時態(tài)，從句的時態(tài)應(yīng)與主句一致。而從句中表示的是過去的將來，所以從句中的謂語動詞應(yīng)用過去將來時。

　　第20題 George did __ than anyone else.

　　A.much work

　　B.more work

　　C.work much

　　D.work more

　　【正確答案】：B