问题

we are not attacked by nuclear weapons, we promise that uncler no circumstances use the bombfirst but we rescrve the right to use it for counter-attack when necessary[ ]
A: As long as; we shall
B: If; shall we
C: So long as; shall we
D: Even if; we shall
B: If; shall we
C: So long as; shall we
D: Even if; we shall
正确答案是:
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