题目内容

If I _ so busy, I _ the lecture that day.

A. were not be/ should attend
B. should not/ should have attend
C. was not/ would attend
D. had not been/ would have attended

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A. knew / would drive
B. knew/ will drive
C. knew/ would have drive
D. had known/ would drive

A. shouldn’t succeed
B. could not have succeed
C. will not succeed
D. should not have succeeded

A. could take/ started
B. could have taken/ had started
C. could take/ had started
D. could have taken / started

A．细胞和黏合质
B．细胞和纤维
C．细胞和基质
D．细胞和间质