题目列表(包括答案和解析)
Black holes _____ not be seen directly, so determining the number of them is a tough task.
A. can B. should C. must D. need
Black holes _____ not be seen directly, so determining the number of them is a tough task.
A. can B. should C. must D. need
Black holes ________ not be seen directly, so determining the number of them is a tough task.
A.can B．should C．must D．need
Black holes _____ not be seen directly, so determining the number of them is a tough task.
A. can B. should C. must D. Need
(2006·上海)
Black holes ________ not be seen directly, so determining the number of them is a tough task.
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