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______ has been announced, we shall have the singing competition next month.
A.ThatB.AsC.ItD.What
B

试题分析:考查非限制性定语从句。本句中的as是定语从句中的关系代词,引导非限制性定语从句,指代很后面一句话的内容,在句中做主语。句意:正如所宣布的那样,我们在下个月要进行歌唱比赛。CD两项不能引导定语从句,that不能引导非限制性定语从句。故B正确。
点评:非限定性定语从句起补充说明作用,缺少也不会影响全句的理解,在非限定性定语从句的前面往往有逗号隔开,如若将非限定性定语从句放在句子中间,起前后都需要用逗号隔开。需要注意 which引导的非限定性定语从句是用来说明前面整个句子的情况或主句的某一部分。 在非限定性定语从句中,关系词不能用that。
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