His writing is so confusing that it's difficult to make out ________ it is he is trying to express.(2011·安徽，33)
| 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.(2011·安徽，33)
| A．that | B．how | C．who | D．what |
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