Question

3. Why did you keep it a secret from us? We        about it. (tell)

你为什么对我们保密呢？你应该告诉我们的。

Answer 1

3. should have been told考查情态动词的用法。根据句意，表达"本应该做(却没做)"之意，含有责备的语气，用should have done结构。could have done本能够/可以做(却没有做).needn' t have done本没必要做(却做了 ),shouldn't have done 本不应该做(却做了) ，might have done本可能做(却没有做)或有可能做过某事，must have done 一定做过某事，can't / couldn't have done绝不可能做过某事。