It is necessary for us________ good habits in our daily life.
A．keepB．to keepC．keepingD．kept
B
考查句型：it’s+形容詞+for sb to do sth表示對某人來說做某事怎樣。It 作形式主語，真正的主語是后面的不定式，句意：在我們的日常生活中對我們來說保持良好的習(xí)慣是必要的。所以選B。
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