They concentrated their efforts on ______ products of high quality.A、turning on

游客2024-07-06  9

问题 They concentrated their efforts on ______ products of high quality.

选项 A、turning on
B、turning off
C、turning out
D、turning over

答案 C

解析 本题测试的是动词短语的辨析。全句的意思是:“他们集中精力生产高质量的产品。”turn sth. on意为“打开”;rum sth. off意为“关闭”;turn sth. out意为“制造,生产”;turn over意为“翻转,使跌落”。根据句意,应选答案C。
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