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