— You may find the key to the maths problem on page 107.
— Ah, it’s so simple. I wonder why I_________of that.
| A．hadn’t thought | B．haven’t thought | C．didn’t think | D．wasn’t thinking |
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— You may find the key to the maths problem on page 107.
— Ah, it’s so simple. I wonder why I_________of that.
| A．hadn’t thought | B．haven’t thought | C．didn’t think | D．wasn’t thinking |
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