The incorrect word is A) mustn´t
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“she forced a smile, hoping to reassure her sister, though she felt anything but sure herself.”
Answer:
SLIME
Acronym Definition
SLIME Superior Lisp Interaction Mode Extended
SLIME Superior Lisp Interaction Mode for Emacs
SLIME Subsurface Life in Mineral Environments (biology)
SLIME Science Links in Museum Education (UK)
Explanation:
I hope this helps answer your question
If you tell me the expressions maybe I could help.