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You can get the best result ______you carry out the experiment under the desired conditions.

A．what if B．even if C．only if D．a(chǎn)s if

C

解析試題分析：考查連詞：A. what if倘若…又如何？B. even if即使，C. only if只有如果…，D. as if好像，句意：只有你在需要的條件下做實(shí)驗(yàn)才能得到最好的結(jié)果。選C。
考點(diǎn)：考查連詞

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