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You must follow the directions exactly, and if you should become          you must take the time to back again and read them over.
A．confusedB．to be confusedC．to confuse D．confusing
A

試題分析：句意，你必須完全按照指南辦事，如果你清楚，你必須花時間重新再讀一下。become是系動詞，后面要用形容詞或名詞作表語，所以選A，困惑的，不明白的。
點評：系動詞后要接形容詞或名詞作表語。
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