This is _______ difficult problem that few students can work it out. [ &...
Thisis_______difficultproblemthatfewstudentscanworkitout.[]A.soB.soaC.suchD.sucha...
This is _______ difficult problem that few students can work it out. [ ]
A. so B. so a C. such D. such a 展开
A. so B. so a C. such D. such a 展开
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