She searched all the places where she _____ have left her necklace but it was all in vain.
A．mightB．wouldC．couldD．should
A
考察情態(tài)動詞。   A. 可能；也許   B. 將要    C. 能夠   D. 應(yīng)該。句意：她找遍了所有她可能留下她的項(xiàng)鏈的地方，但是她白忙了。選A。
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