________ some students are not aware of is ________ difficult life can be if they are not devoted to study.
| A．That; how | B．Which; what |
| C．What; what | D．What; how |
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________ some students are not aware of is ________ difficult life can be if they are not devoted to study.
| A．That; how | B．Which; what |
| C．What; what | D．What; how |
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