——She looks very happy. She       have passed the exam.    ——I guess so. It’s not difficult after all. 
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A
should
B
could
C
must
D
might
推荐题目
 This book ______ , because his name is on the book. 
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A
can be Tom’s father’s
B
can’t be Tom’s father’s
C
must be Tom’s father’s
D
must be Tom’s father