—Where Margaret have put the empty bottles?—She them away. They must be somewhere.A. can

问题补充：

—Where Margaret have put the empty bottles?

—She them away. They must be somewhere.

A. can; can’t have thrown

B. must; needn’t

C. must; must have thrown

D. can; must throw

答案：

(答案→)A. can; can’t have thrown

B. must; needn’t

C. must; must have thrown

D. can; must throw

解析：本题考查情态动词+have done表示对过去事实的推测的用法。must have done用于肯定句中，疑问句否定句中应用can could代替must。故选A。