____has been said before, it is not easy to learn a foreign language.A．AsB．ItC．W
题型：不详难度：来源：
| ____has been said before, it is not easy to learn a foreign language. |
答案
| A |
解析
| as表“正如”，引导非限制性定语从句，代替后面整个主句的意思。 |
举一反三
The city is built _____ two rivers come together.| A．in which | B．which | C．where | D．that |
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__________ entered the office when he realized that he had forgotten his report.| A．He hardly had | B．Had he hardly | | C．Hardly had he | D．Hardly he had |
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| Helen is much more kind to her youngest child than to the others,___________ of course, make the others unhappy. |
You’d better choose someone____ you think ___ kind and friendly to help you.| A．whom; to be | B．who; is | C．that; is | D．which; to be |
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| Moreover, __________you may hardly believe, the examiners had decided in advance to fail half the students taking part in the exams. |
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