7、Black holes _____ not be seen directly, so determining the number of them is a tough task.
A. can B. should C. must D. need
科目:高中英语 来源: 题型:
Black holes _____ not be seen directly, so determining the number of them is a tough task.
A. can B. should C. must D. need
科目:高中英语 来源: 题型:
Black holes _____ not be seen directly, so determining the number of them is a tough task.
A. can B. should C. must D. need
科目:高中英语 来源: 题型:
Black holes ________ not be seen directly, so determining the number of them is a tough task.
A.can B.should C.must D.need
科目:高中英语 来源: 题型:
Black holes _____ not be seen directly, so determining the number of them is a tough task.
A. can B. should C. must D. Need
科目:高中英语 来源: 题型:014
(2006·上海)
Black holes ________ not be seen directly, so determining the number of them is a tough task.
[ ]
科目:高中英语 来源:同步题 题型:单选题
科目:高中英语 来源: 题型:单选题
科目:高中英语 来源:英语外研必修五设计 外研版 题型:016
Black holes ________ not be seen directly,so determining the number of them is a tough task.
can
will write
must
need
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