A spokesperson for Solaris International announced that the company would ______ on strengthening investor relations in South Am

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问题 A spokesperson for Solaris International announced that the company would ______ on strengthening investor relations in South America.

选项 A、repeat
B、surpass
C、franchise
D、concertrate

答案D

解析 concertrate on表示“专心致志于……”，符合题意，其他三项后面都不能跟介词on。故本题正确答案为D。

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小学英语

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