题目内容

实对称矩阵和对角矩阵既相似又合同

A. 对
B. 错

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The book________ by Jennifer by the end of last month.

A. have finished
B. finished
C. have been finished
D. had been finished

A stylish bike was bought ________ me by my parents as a birthday present.A. to B. for C. by D. on

A. to
B. for
C. by
D. on

A stranger ________ walk into the building.

A. has seen to
B. was seen to
C. has seen
D. was seen

I _______one day to decide whether I should accept this invitation.

A. give
B. gave
C. has given
D. was given

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