问题
选择题
. It is necessary for us to learn _____ second language ____ our mother tongue.
A．the; besides
B．a; except
C．the; except
D．a; besides
答案
答案：D
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. It is necessary for us to learn _____ second language ____ our mother tongue.
A．the; besides
B．a; except
C．the; except
D．a; besides
答案：D