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问题: 急求~英语小选择〈11

The trees have all been blown away by the strong wind ,you _____more trees


A,ought to plant
B,should plant
C must have planted
D ought to have planted

解答:

选择B
这里首先排除CD,因为它们都含有完成时态的意思
剩下ought to和should了,ought to 含有强烈的客观要求,有命令的语气,倾向于法律上的责任和要求;而should表示主观意见,“应当、应该”,所以应当选should plant。