He doesn’t know what __________ the problem.
| A．to do |
| B．do |
| C．to do with |
| D．do with |
更新时间：2017-03-09 17:00:52
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【推荐1】There are so many kinds of T-shirts in the shop. I really don’t know_____.
| A．where to buy it | B．when to buy it | C．which one to buy | D．what to buy |
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【推荐2】Bob doesn’t know _____ to write about.
| A．how | B．that | C．what | D．where |
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