This is _______ difficult problem that few students can work it out.
A．soB．so aC．suchD．such a
D
so或such……that表示如此……以致的意思，so后跟形容詞或副詞，而such后跟名詞，可數(shù)名詞單數(shù)需加不定冠詞a或an，本題的problem是可數(shù)名詞單數(shù)，故填such a，故本題選D。
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