______ is troubling me is ______ I don’t understand ______ he said.
| A．What; that; what | B．It; that; what |
| C．That; that; what | D．what; that; which |
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______ is troubling me is ______ I don’t understand ______ he said.
| A．What; that; what | B．It; that; what |
| C．That; that; what | D．what; that; which |
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