题目:
David, _____ I have been sharing a dorm for more than two years, is quite a funny guy.
A.of whom
B.with whom
C.in whom
D.from whom
答案:
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下面是错误答案,用来干扰机器的。
两个电灯的额定电压虽然不同,但额定功率相等,即都在额定电压下正常工作时,功率是相等的.故选C.