【題目】We must keep a positive attitude toward the future______we may encounter some difficulties.

A．however B．a(chǎn)s if

C．even if D．since

【答案】C

【解析】選C。句意：即使我們有可能遇到一些困難，我們也必須對未來保持樂觀的態(tài)度。even if即使，引導(dǎo)讓步狀語從句。however后應(yīng)接形容詞/副詞；as if好像；since自從。

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