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单选题

Decisionmakersmusthavesomewayofdeterminingofseveralalternativesisbest.()

A
that
B
it
C
one
D
which

题目答案

D

答案解析

暂无解析
举一反三
单选题

InAugust1977,asatellitetogatherdataaboutthe10millionblackholeswhicharethoughttobeintheMilkyWay.

A
launched
B
waslaunched
C
hasbeenlaunched
D
islaunched

题目答案

B

答案解析

暂无解析