Up to the end of WW II,there were（）waves of large-scale emigration to the United States.<br>A:four<br>B:two<br>C:three<br>D:None of the above

Up to the end of WW II,there were（）waves of large-scale emigration to the United States.
A:four
B:two
C:three
D:None of the above

出自：00522《英语国家概况》

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