rtokens: Major told parliament on Thursday he would keep his options open on single-currency membership .
pos: NNP VBD IN NNP PRP VBD VBN TO VB CC VBD PRP$ NN IN DT JJ NN VBD IN NN IN DT IN NNP NNP NNP NNP .
tokens: Clarke denied on Thursday he had threatened to resign and said his position on the single currency was in tune with that of Prime Minister John Major .
ltokens: Marlow 's comment come on the heels of speculation that Clarke had threatened to resign if the government changed its " wait and see " policy on a single currency and declared it would not sign up for the currency in the next Parliament .