It's important _______us to learn a second language_______our mot_英语解答

It's important _______us to learn a second language_______our mother tongue.
A.for,besides B.for,except C.to,except D.to,besides

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解答

B
it is +形容词+for/of sb to do sth
for,固定句型
except出了.之外（不包括）
besides(包括的意思)