If urban noise levels from increasing, people shout to be heard even at dinner()
A. are not kept; will have to
B. are not kept; have to
C. do not keep; will have to
D. do not keep; have to
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The missing boy was last seen in the playground()
A. play
B. to have played
C. played
D. playing
Russian, Jack has to study a second foreign language()
A. Except
B. However
C. In addition to
D. Moreover
Before she went abroad she spent as much time as she could English()
A. practice to speak
B. practicing speaking
C. practice speaking
D. to practice speaking
下列属于广域网的是。 (请选择3个答案)()
A. 中国公用分组交换网
B. 中国公用数字数据网
C. 企业内部网
D. CNGI(China Next Generation Internet)