15. When Madam Curie did the experiment again, she was more careful where she _____ a mistake.
| A．made | B．has made | C．was making | D．had made |
相关试题
Her mother ____ her stories patiently every evening when she was a little girl.
| A．was used to tell | B．is used to telling | C．used to tell | D．used to telling |
____ books have been given away since the Hope Organization was founded.
| A．A great many of | B．The major of | C．The majority | D．A great many |
____ I got to the reading-room, I found that he ____ there.
| A．At every time; read | B．Each time; was reading |
| C．At each time; would read | D．Every time; reads |
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