—You may find the key to the math 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 math 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 |