题目内容
―Alice, you look puzzled. Have you understood it?
―Yes, I another problem just now.
A．have thought of B．thought of C．was thinking of D．had thought of
C
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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 |