-Shall I tell john about it?-No,you ______.Idon't know his telephone number.

问题描述:

-Shall I tell john about it?-No,you ______.Idon't know his telephone number.

can't
从尾句Idon't know his telephone number.得出是客观上无法告知john,而不是主观上不告知.所以应该用受限回答.