It‘s uncertain () the experiment is worth doing. A.if B.that C.how D.whether 求解释~O(∩_∩)O~
2024-12-20 18:18:11
推荐回答(2个)
回答1:
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