题文
The math problem is so hard, I really don’t know _____.
| A．how to do it | B．how to do |
| C．what to do it | D．when to do |
The math problem is so hard, I really don’t know _____.
| A．how to do it | B．how to do |
| C．what to do it | D．when to do |
试题篮
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