These special eggs ( ) by scientist.A keepB keptC were keepD are kept

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These special eggs ( ) by scientist.A keepB keptC were keepD are kept
These special eggs ( ) by scientist.
A keep
B kept
C were keep
D are kept

These special eggs ( ) by scientist.A keepB keptC were keepD are kept
D
这里要用被动,而keep的过去分词是kept,所以选D
意思是:这些特殊的蛋由科学家们保管.

D. are kept