【題目】I cannot(專心于) on my work when I'm hungry.

【答案】concentrate
【解析】句意:我在感覺餓的時候不能專心于工作?崭袂懊媸乔閼B(tài)動詞。情態(tài)動詞后用動詞原形,concentrate on固定短語,“專心于”,因此填concentrate。

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