Mary _____ be in Paris. I saw her an hour ago.A. may notB. cannot
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I'm afraid you _____ do this; it is a rule of the college.A. mustB. have to
You _____ do what I tell you.A. mustB. have to
How _____ be so stubborn.A. can heB. is he able to
( )是指3岁前记忆一般不能永久保持的现象。
A. 幼年健忘
B. 永久性遗忘
C. 健忘症
D. 提取失败
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