If you take good care of my computer, you ()
keep it with you for a week.
A will
B shall
C may
D should
答案是B，请解释

shall 用作情态动词时,适用于第二人称和第三人称，可以表示“许诺”的意思：

　　You shall hear everything directly you come .你一来就可以听到一切了。

　　"Whatever you want you shall have , "said the Fairy .

　　仙女说："你想得到什么，你就可以有什么。"

　　I don't want to be hard on your daughter ; she shan't be pressed .

　　我不想对你女儿太严厉，她不会太受压的。

　　I promise that you shall see her again before long .

　　我保证你不久就能再见到她。