① It is important _____ us ______ exercise regularly.
B for, to
固定句型：It's adj for sb. to do sth. 对某人来说做什么事是怎么样的
② _____ the four seasons, which season do you like best?
BOf
Of the four seaso被提到最前面了，正常语序应该是
which season do you like best of the four season
B, B
for sb. to do sth.
of the four seasons, of 表示比较的范围
B,B
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