题目内容
—Alice, you look puzzled．Haven’t you understood it?
—Yes．I _of another problem just now．
A．had thought B．have thought C．thought D．was thinking
D
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Alice, you’d better put the vase away ________ it gets broken.
| A．when | B．before | C．unless | D．while |
---Alice, you look puzzled, Have you understood it?
---No．I _____another problem just now．
| A．l have thought of | B．am thinking of |
| C．had thought of | D．was thinking of |