摘要：( )It is difficult for us climb up the mountain. A. very, can’t B. too, not C. too, to D. very, to
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It is _______ difficult for us _______ climb up the mountain.
[ ]
A. very, can' t
B. too, not
C. too, to
D. very, to
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B. too, not
C. too, to
D. very, to