—Will he come?
—I am not sure ___he will come, but I never doubt ______he will help us.
| A．that, if | B．that, that |
| C．if, if | D．if, that |
—Will he come?
—I am not sure ___he will come, but I never doubt ______he will help us.
| A．that, if | B．that, that |
| C．if, if | D．if, that |
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