We specialize_______ all kinds of metals and are always ready to buy in large quantities.
A、in
B、from
C、on
D、at
【正确答案】:A
【题目解析】:句意:我们专门研究各种金属,并且准备大量购买。specialize in表示“专攻,专门研究”。
We specialize_______ all kinds of metals and are always ready to
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