21 B 表示对现在的影响,用现在完成时 这不就是你前面问的13题嘛?
22 B 将来时
23 C 虚拟语气.他应该好好准备的.
24 C 看到since就用完成时
25 A 吃得越多月不舒服the more the more句型
26 B 以后一个的动词为准
27 A 虚拟.他们会吵到睡觉的孩子.
28 A 其他都不对
29 A 凭语感,没有为什么
30 B 没有be missed,然后这里要用完成时
21.While people may refer to television for up to the minute
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