Jack asked his brother____Betty.A.if he knowsB.whether he knew

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Jackaskedhisbrother____Betty.A.ifheknowsB.whetherheknewJackaskedhisbrother____Betty.A.ifheknowsB.whe

Jack asked his brother____Betty.A.if he knowsB.whether he knew
Jack asked his brother____Betty.
A.if he knows
B.whether he knew

Jack asked his brother____Betty.A.if he knowsB.whether he knew
B.
因为前面asked是过去时态,从句要保持时态一致

B