since引导时间状语从句通常以肯定的形式与主句的“现在完成时”连用,但其所表示的含义却有肯定与否定两种:1.当since从句的谓语是终止性动词时,表示肯定含义,意为“自从……以来”,例如:It is three years since she began to smoke. (她抽烟已经3年了);2.当since从句...
12. The scientists have come to the conclusion, based on the signals and photographs sent back by the satellite, ___ there is no life on Venus. A. that B. which C. what D. where 解析:本题考点是同位语从句,修饰conclusion,只能用that 引导同位语从句,故...
which, when taken up by broadcasters and the lay press, which引导的非限定性定语从句中when引导的状语从句部分。在该状语从句中,when后面直接跟taken up,省略了it was,补充完整是when it was taken up by...broadcasters在此处表示:广播公司;电视台。翻译为广播员...
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