D
uncertain 是不确定,而后面却是一个陈述句,所以用whether
It's uncertain ______ the experiment is worth doing.
It's uncertain ______ the experiment is worth doing.
A.if B.that C.how D.whether
A.if B.that C.how D.whether
其他人气:645 ℃时间:2020-03-07 12:41:48
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