【正文】
C. which D. whose 18) All is a nice meal and a good rest . A. what I want B. that I want C. the thing wanted D. which I want 19) It was quite by accident that Harry discovered that a man was living near his office. He had been friendly with the man as a student A. with whom he had been friendly as a student B. whom he been friendly with when a student C. who he had been friendly with when a student D. whom he had been friendly as a student 20) Xenon( 氙 ) has a number of applications , may be mentioned its use in flash lamps for highspeed photography . 4 A. among which B. which C. and which D. each of which ADDDC,BDCAC, CBBAA