1 . _____ was known to all , William had broken his promise ______ he would give us a rise.
A.As; which | B.As; that | C.It; that |
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2 . St Petersburg is a very beautiful city, ________ was once called Leningrad. (用适当的词填空)
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3 . ________ all we know, he is an excellent scientist(用适当的词填空)
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