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问题: __When will you buy me a somputer,Dad?

__When will you buy me a computer,Dad?
__Don't worry.You__have it soon,I promise.
A.shall B.should C.must

解答:

选shall,在第二,三人称中使用shall往往表示上级对下级,长辈对晚辈的允诺,命令,强制等等。