Having lived in China for 8 years, Helen has a good ____________ of both English and Chinese.
A．a(chǎn)bilityB．guidanceC．commandD．program
C

試題分析：考查名詞和詞組：A. ability能力，B. guidance 指導(dǎo)，C. command命令，掌握，have  a good command of“精通”，D. program節(jié)目，課程，句意：在中國(guó)生活了8年，海倫精通英語和漢語。選C。
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