问题

Many people can’t learn any lessons from the mistakesthey’ve made _____ they get hurt somehow.

A:whether
B:unless
C:if
D:as

正确答案是：

同类题型

“Passengers _____ not have their breakfast on thelight train”. This rule arouses heated debates in Chongqing.

To get here in time, they came _________ all the way.[ ]

Cindy shut the door heavily and burst into tears. Noone in the office knew shewas so angry.

－ Is yourfather in－ No, he______ for three hours.

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