William, as well as his friends， invited to my birthday party the day before yesterday.
A. is
B. was
C. are
D. were
网友回答
A. is
(答案→)B. was
C. are
D. were
解析：本题考查主谓一致和时态。当主语后跟由as well as, with, together with, along with等连接的词组时，其谓语动词不受这些词组的影响，与前面主语的单复数一致。再结合the day before yesterday可知用一般过去时。