---Alice, you look puzzled, Have you und
题型:选择题
问题:
---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
---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