We must ___ on our study..
A.concentrateB.concentrate atC.concentrate onD.concentrate with
C
題意為:我們必須全神貫注于我們的學(xué)習(xí)。此題考查固定短語(yǔ)的應(yīng)用。Concentrate on … 意為“集中(注意力)于….專(zhuān)心于…”。其余選線不存在搭配。故選C。
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