《解析》
22.one morning i was sitting at my desk when a policeman__________ at the door.
a. knocked b. was knocking c. had knocked d. knocks
《答案》a
《解析》我正坐在桌旁， 这时一个警察来敲门。本句是be doing…when…。
23.he had a lot of friends, but none of_________ could lend him any money.
a. whom b. them c. which d. who
《答案》b
《解析》but 是连词，所以不能选连词。a,c,d排除，选b。
24._________james was sleepy, he stayed up late to finish his project.
a. as b. since c. unless资源难易程度:★★★★★★★★★★★★★★★
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