问题补充：
Our teacher told us last night that .
A. English is difficult to be learnt
B. the English is difficult to learn
C. the English language is difficult to learn
D. English language is difficult to learn
答案：
A. English is difficult to be learnt
B. the English is difficult to learn
(答案→)C. the English language is difficult to learn
D. English language is difficult to learn
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