—The problem is very difficult. I'm afraid you can't work it out now.
— I fail this time, I will try it again.
| A．Even if | B．Since | C．As if | D．Though |
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—The problem is very difficult. I'm afraid you can't work it out now.
— I fail this time, I will try it again.
| A．Even if | B．Since | C．As if | D．Though |
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