. — Why was Professor Johnson unhappy those days?
— The only reason was ________the theory he stick to ____ wrong.
| A．that; proving | B．why; being proved | C．that; proved | D．why; was proved |
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. — Why was Professor Johnson unhappy those days?
— The only reason was ________the theory he stick to ____ wrong.
| A．that; proving | B．why; being proved | C．that; proved | D．why; was proved |
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