A man does not know the difficulty of anything _________ he does it personally.
A、although
B、if
C、because
D、unless
【正确答案】：D
【题目解析】：连词unless本身具有否定意义：i￡..not，引导的是否定的条件句，这种否定的条件句从反面来强调的语气，一些语法学家称它为“反面的惟一条件句”，如：One cannot master a foreign language well unless he studies it hard.
A man does not know the difficulty of anything _________ he does
- 2024-09-16 18:20:19
- 英语（专升本）(z0009)