题文
You never know how much difficulty we had _________________ the problem. Luckily, we try to solve it with Mrs Wu’s help.
| A．working out | B．work out |
| C．worked out | D．to work out |
You never know how much difficulty we had _________________ the problem. Luckily, we try to solve it with Mrs Wu’s help.
| A．working out | B．work out |
| C．worked out | D．to work out |
试题篮
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