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could you please tell us_______ tom has gone to america?

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could you please tell us_______ tom has gone to america?
a,how often b,how long.c,if d,when
主要解释下how long 和when为什么不可以,
could you please tell us_______ tom has gone to america?
how long 表示多长时间,主要用来对一段时间(如three days, four weeks 等)提问,不能用于完成时态吧.
when 1.什么时候 2.（用于时间的表达方式之后）在那时, 其时 3.其时；当时；当场
用于完成时态,“他什么时候已经去了美国”,不太说得通吧.
Mum,could you tell please me ____ Dad has gone to London? —Could you tell us_______?---For more than ten years. 1.Tom has been to London .Could you tell me __________( ) -where is Tom -he has gone to America for _____(far) study Could you tell me _______?A.where you have gone B who has br Could you please tell me where he had gone?请问这句话哪里出错了? could you tell me where __ A Li Ming is B has Li Ming gone could you please tell me Could you please tell me______? could you please tell me+ Could you tell me___,please? -- could you please tell me the answer to the question?