---Where is my reference book? It was here a moment ago.---Someone it by mistake. A. shou

问题补充：

---Where is my reference book? It was here a moment ago.

---Someone it by mistake.

A. should have taken

B. must take

C. might take

D. must have taken

答案：

A. should have taken

B. must take

C. might take

(答案→)D. must have taken

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