It—be David＇s book,because his was last yesterday.

題目：

It—be David＇s book,because his was last yesterday.
A.must B.mustn＇t C.may D.can＇t
說下原因,並翻譯,

解答：

D
表示否定推測
那一定不是david的書 因爲他的昨天丟了
last 應該是lost
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