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单选题
Experts have been warning _____ of the health risks caused by passive smoking.
A
at a time
B
at one time
C
for some time
D
for the time
参考答案
参考解析
解析：
句意为“专家们提醒注意吸入二手烟给健康带来的危险已有一段时间了”。at a time＝on each occasion“每次，一次”；at one time＝at a period of time in the past“一度，曾经”；for the time“暂时，眼下”；for some time=for a fairly long period of time“一段时间”。
句意为“专家们提醒注意吸入二手烟给健康带来的危险已有一段时间了”。at a time＝on each occasion“每次，一次”；at one time＝at a period of time in the past“一度，曾经”；for the time“暂时，眼下”；for some time=for a fairly long period of time“一段时间”。
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could have enjoyedB
had enjoyedC
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