Question
The total mass of the Galaxy, which had seemed
reasonably well established during the 1960s, has become a matter of considerable uncertainty. i.which had seemingly reasonably well ii.which had seemed reasonable well iii.which has seemed reasonably wellSolution
The sentence is referring to a point in past, hence, had is correct. Seemed is the main verb which requires an adverb to qualify it, hence, reasonably is the verb which is correct.
0.3Ì…2Ì… + 0.54Ì…8Ì… - 0.1Ì…9Ì… is equal to :
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