No other drug is available at present_____can produce the same therapeutic effect with less risk.

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问题 No other drug is available at present_____can produce the same therapeutic effect with less risk.

选项 A、that
B、than
C、when
D、as

答案A

解析 语法类试题(定语从句)。that引导定语从句修饰drug。由于后置定语较长而谓语很短,为了使结构匀称和协调自然,便把定语移至谓语之后,因而造成了中心词与其定语的分隔现象。考生应熟悉这种分隔现象,以免造成语义上的误解而做出错误选择。 .
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