The professor put forward three issues, none of _____ we had ever done any research into before.
| A．them | B．which | C．what | D．that |
相关试题
.Don't ____ when other people are talking.
| A．cut through | B．cut across | C．cut into | D．cut in |
After supper she would sit down by the fire , sometimes for _____an hour ,
thinking of her young and happy days.
| A．as long as | B．as soon as | C．as much as | D．as many as |
It was several minutes before I was ____ of what was happening.
| A．fond of | B．realized | C．aware of | D．prepared of |
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