) but on what types of occasions. " As was recently discussed here, it doesn't seem fair to provide to more tha one grammatically okay answer and ask which is correct. However, if it asked "which is best" then C gives the expected answer.
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Grammar GeekLRR: Thanks for that! I had no idea that "on the weekend" would be wrong in British English!I was surprised to find the following when I looked up 'weekend' in the Oxford Advanced Learner's Dictionary.