His writing is so confusing that it’s difficult to make out ________ it is he is trying to express.
| A．that |
| B．how |
| C．who |
| D．what |
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His writing is so confusing that it’s difficult to make out ________ it is he is trying to express.
| A．that |
| B．how |
| C．who |
| D．what |
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