Alight with no more power than ______ by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pin

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问题 Alight with no more power than ______ by an ordinary electric light bulb becomes intensely strong as it is concentrated to a pinpoint-sized beam.

选项 A、as is produced
B、that produced
C、that is produced
D、produced

答案B

解析 相当于A light with no more power than the power that is produced by... that 代替power,表示相比较的事物,而D中没有比较对象,故不对;as 表示原级比较,不与than 用在一起,故A也不正确;C中缺少that 的先行词,也是错误的。
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