A. listening B. being listening C. to be listening D. to listen
解答：选（A）有些不及物动词只能用动名词做宾语，题中的enjoy就是其中一个，类似的还有avoid，admit，appreciate，consider，complete，deny，escape，finish，imagine，mind等。如：My English teacher told me to avoid making such spelling mistakes.我的英语老师告诉我避免犯这样的拼写错误。enjoy还可以用于enjoy oneself表示“感到快乐；过得愉快”。
48. She wanted to know _________ child it was on the grass.
A. that B. whose C. what D. whom
解答：选（B）考查宾语从句，由于know是及物动词，其后接宾语从句，在此句中只有whose符合题意。又如：He can hardly judge whose answer is correct.他几乎不能判断谁的答案是正确的。
49. This is the microscope _______which we have had so much trouble.
A. at B. from C. of D. with
解答：选（D）考查定语从句，由“介词 + 关系代词”构成，而选项中只有with能与have trouble连用，have trouble with意为“惹麻烦，出乱子”。如：She seems to have trouble with her teaching program.她的教学计划似乎出了麻烦。
50. He got a message from Miss Zhang _____ Professor Wang coul
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