Tom Sam may go with you because one of them must stay at home.A. Both; andB. Either; or

问题补充：

Tom Sam may go with you because one of them must stay at home.

A. Both; andB. Either; or C. Not only; but also

答案：

解析：句意：或者汤姆或者塞姆可以和你去，因为他们中的一个必须要待在家里。Either…or…或者…或者…，Both…and…两者都…，Not only…but also…不仅…而且…。结合句意可知，本题选B。