撤回要约的通知晚于要约到达相对人,不发生撤回的效力;受要约人已于接到撤回通知前承诺的,原要约仍有效。()
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_____caused the accident has not yet been found.
A. Which
B. Whichever
C. What
D. Whatever
I think it advisable that an armed guard_____in readiness.
A. is standing
B. will stand
C. stands
D. stand