This is ______ difficult problem that few students can work it out.A．soB．so aC．s_刷题宝

题干

This is ______ difficult problem that few students can work it out.

A．so

B．so a

C．such

D．such a

上一题下一题 0.64难度单项选择更新时间:2014-11-18 07:50:54

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