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We must ___ on our study..
A.concentrateB.concentrate atC.concentrate onD.concentrate with
C
题意为:我们必须全神贯注于我们的学习。此题考查固定短语的应用。Concentrate on … 意为“集中(注意力)于….专心于…”。其余选线不存在搭配。故选C。
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