---Alice, you look puzzled, Have you understood it?
---Yes.I _____another problem just now.
A.l have thought of | B.am thinking of |
C.had thought of | D.was thinking of |
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---Alice, you look puzzled, Have you understood it?
---Yes.I _____another problem just now.
A.l have thought of | B.am thinking of |
C.had thought of | D.was thinking of |