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求老师解答:It'sdifficultIt'sdifficultEnglishwell.Wemustworkhard.[]A.learnB.learnsC.studyD.tolearn

题目详情
求老师解答:It's difficult _____
It's difficult _____ English well.We must work hard.

[     ]
A.learn
B.learns
C.study
D.to learn
▼优质解答
答案和解析
D