問題詳情：
President Hu's visit to Austria，______first by a Chinese president in 12 years，is regarded of _______great importance to global economic situation at present.
A．a：不填 B．the；a C．the；不填 D．the；the
【回答】
C 考察冠詞，第一空序數詞前加定冠詞the，第二空be+of +n．= be+adj．
知識點：冠詞
題型：選擇題
