﹣﹣﹣________times have you visited Gansu Science Museum？
﹣﹣﹣Only once．（ ）
A．How oftenB．How manyC．How longD．How soon
﹣﹣﹣________times have you visited Gansu Science Museum？
﹣﹣﹣Only once．（ ）
A．How oftenB．How manyC．How longD．How soon
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