单项选择题

______ I was going out, it began to rain.

A．When
B．While
C．As
D．Since
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单项选择题
Neither Mary nor I ______ to Shanghai before.
A．A ) has gone
B．have gone
C．has been
D．have been
单项选择题
Swedish is the ______ language of most Swedes.
A．natural
B．native
C．home
D．mother
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