A
这是it is adj for sb.to do sth.的句型.
B
和fomer相对应的是latter
B
hear from 意思是受到来信
这里是对频率提问,用how often
C
有as,前面必定还有一个as,排除AD,B语序不对,所以C最恰当.
1.It's necessary____ the book immediately.
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