问题补充：
－Hello, May I speak to Daniel?
－.
A. Sorry, he’s not at home. Who’re you?
B. Sorry, he’s not at home. Who’s that speaking, please?
C. Sorry, you can’t.
D. Sorry, you mustn’t.
答案：
A. Sorry, he’s not at home. Who’re you?
(答案→)B. Sorry, he’s not at home. Who’s that speaking, please?
C. Sorry, you can’t.
D. Sorry, you mustn’t.
解析：在电话用语中，this指代我，that指代你，A,C,D中不符合表达习惯，故选B.句意：—你好，我想找一下Daniel？—对不起，他不在家，请问你是谁？。
