I can’t find my socks. Where ________ I have dropped them?
A．mustB．canC．wouldD．should
B

試題分析：此處must必須，一定；can可能； would會(huì)，過去常常；should應(yīng)該。此處是can have done的形式，表示對過去發(fā)生事實(shí)的推測。故選B。句意：我找不到我的襪子。我可能把它們放哪里了呢？can 表推測用于疑問句和否定句。
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