important tool(工具)the computer is!  -I think so.
A．What aB．HowC．What anD．How an
C
因?yàn)楹竺婷~tool為可數(shù)名詞單數(shù).故用what a/an又根據(jù)important的第一個(gè)音標(biāo)為元音.故選C
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