问题
Tony, you look puzzled. Have you understood me —- I’m sorry. I _____ another problem just now.
A:thought of
B:am thinking of
C:had thought of
D:was thinking of;
B:am thinking of
C:had thought of
D:was thinking of;
正确答案是：
同类题型
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Which word’s pronunciation(发音) is different from others
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