Now 70 years old, the British physicist, Pendry can’t remember a time when he was not asking a question as a kid, joking that he ________ his parents to death.

A．should torment(折磨)

B．must torment

C．must have tormented

D．should have tormented

EXCEL允许在单元中输入公式，公式中可以使用两个字符值拼接的字符运算符是&。