2. 外语
  3. They concentrated their efforts on ______ products of high quality.

They concentrated their efforts on ______ products of high quality.

admin2009-06-28  42
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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