The following sentence is from New Hello, Third Secondary, Egypt.
My parents ….. have a mobile phone.
a) all b) each c) every d) both
The model answer is both, but I wonder if 'each' is also a possible answer. However, is it necessary to use commas if 'each' is another possible answer, i.e My parents, each, have a mobile phone?
Thanks for anyone who can help me out!