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Where is you sister?she ( ) be in the reading room.She likes

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Where is you sister?she ( ) be in the reading room.She likes reading very much.
A can B must C need Dhave to
给我解题思路,
Where is you sister?she ( ) be in the reading room.She likes
选B
1.因为must除了有“必须”的意思外,还可以表示猜测.
she must be in the reading room.她应该在阅览室里.(表推测,因为后问题到她喜欢阅读,作为推测的根据.)
2.而其他3项与题目意思不符
“can”也可表示推测,但仅用于否定句中,表示“不可能”.eg:She can't be in the reading room because she doesn't like reading.
“need”意为需要做某事;“Have to”意为必须做某事,与题意不符