摘要： A. learn B. learned C. to learn D. learning
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It is important for us ______ English well.
[ ]
A. learn
B. learned
C. to learn
D. to learning
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B. learned
C. to learn
D. to learning
I had a little trouble ______English grammar.
[ ]
A. to leam
B. learning
C. learned
D. learn
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B. learning
C. learned
D. learn