We have to       some bigger companies for technical help.
A．turn upB．turn toC．turn over D．turn down
B　

試題分析：考查詞組辨析：A．turn up出現(xiàn)，露面。B．turn to求助于，C．turn over翻過來，    D．turn down調(diào)低，拒絕，句意是：我們不得不向大公司尋求技術(shù)支持。選B。
點評：平時要特別注意有同樣的動詞和不同的副詞或介詞搭配意思不一樣的詞組。要注意辨別。做題時根據(jù)上下文進行判斷。
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