摘要： I have no idea they have kept in touch with me by writing letters since last year. A. what B. how long C. why D. when
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I have no idea ________ they have kept in touch with me by writing letters since last year.
A. what B. how long C. why D. when
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I have no idea ________ they have kept in touch with me by writing letters since last year.
[ ]
A．what
B．how long
C．why
D．when