To master a foreign language requires hard work so you______study too hard.A.shouldB.must

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To master a foreign language requires hard work, so you______study too hard.

A.should

B.must

C.can"t

D.may not

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗