问题描述:
5.The research is so designed that once ___ nothing can be done to change it.
A.begins B.having begun C.beginning D.begun
11.There was a terrible noise _____ the sudden burst of light.
A.followed B.following C.to be followed D.being followed
Please explain
A.begins B.having begun C.beginning D.begun
11.There was a terrible noise _____ the sudden burst of light.
A.followed B.following C.to be followed D.being followed
Please explain
问题解答:
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