After several sleepless nights, Mr. Smith ______ a perfect solution to the problems.
| A．kept up with | B．put up with |
| C．came up with | D．ended up with |
After several sleepless nights, Mr. Smith ______ a perfect solution to the problems.
| A．kept up with | B．put up with |
| C．came up with | D．ended up with |
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