【題目】Cellphones are ____________ to help students focus on their study.

A. expandedB. prohibited

C. assignedD. relieved

【答案】B

【解析】

考查動詞辨析。句意：為了幫助學生集中精力學習，手機被禁止使用。A. expanded擴張，使膨脹；B. prohibited禁止；C. assigned分配，指定；D. relieved解除，減輕。故選B。

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