–I think it’s going to be a big problem.
--Yes, it could be.
--I wonder ________ we can do about it.
| A．if | B．how | C．what | D．that |
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–I think it’s going to be a big problem.
--Yes, it could be.
--I wonder ________ we can do about it.
| A．if | B．how | C．what | D．that |
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