5.The research is so designed that once ___ nothing can be done to change it.

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
其他人气:995 ℃时间:2019-10-26 06:38:53
优质解答
D 省略句,once it is begun
B following 接着.之后.突然的闪电之后是一声可怕的雷声.
he went into the classroom,following the students.
他跟着学生们进了教室.
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