It‘s uncertain () the experiment is worth doing. A.if B.that C.how D.whether 求解释~O(∩_∩)O~
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![It‘s uncertain () the experiment is worth doing. A.if B.that C.how D.whether 求解释~O(∩_∩)O~](/uploads/image/z/9231884-44-4.jpg?t=It%E2%80%98s+uncertain+%28%29+the+experiment+is+worth+doing.+A.if+B.that+C.how+D.whether+%E6%B1%82%E8%A7%A3%E9%87%8A%7EO%28%E2%88%A9_%E2%88%A9%29O%7E)
It‘s uncertain () the experiment is worth doing. A.if B.that C.how D.whether 求解释~O(∩_∩)O~
It‘s uncertain () the experiment is worth doing. A.if B.that C.how D.whether 求解释~O(∩_∩)O~
It‘s uncertain () the experiment is worth doing. A.if B.that C.how D.whether 求解释~O(∩_∩)O~
选D
这个主语从句有省略部分,完整的是:whether the experiment is worth doing (or not)正因为有括号里的成分,所以不能用if的这个“是否”.that和how都没有“是否”的意思.
It形式主语 ‘s系动词 uncertain表语 (whether) the experiment is worth doing.主语从句