摘要： This is difficult problem that few students can work it out. A. so B. so a C. such D. such a
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This is _______ difficult problem that few students can work it out.
A. so B. so a C. such D. such a
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This is______difficult problem that few students can work it out.
A.so B.so a C.such D.such a
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This is ________ difficult problem that few students can work it out.
[ ]
A. so
B. so a
C. such
D. such a
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B. so a
C. such
D. such a