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It is so cold in Antarctic that the penguins have to stand _

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It is so cold in Antarctic that the penguins have to stand _______to each other to keep warm.
A. closely
B. closed
C. closing
D. close
答案D
本题考查close的用法.close可以作副词,表示“(距离)近地”“紧密地”;closely意为“紧密地,紧紧地”“认真地”“密切地”,通常不与to连用;closed意为“关闭的”.