问题补充:
-- you called yesterday?
-- Tom.Why?
A. Who it is that
B. Who is it that
C. Who was it that
D. Who it was that
答案:
A. Who it is that
B. Who is it that
(答案→)C. Who was it that
D. Who it was that
解析:考查特殊疑问句的强调句型。结构为:疑问词+ is/was + it + that? 根据句意:昨天你究竟给谁打电话了?所以选C。