My brother and I look different ________ we are twins. [ ]A. unless

题型：专项题难度：来源：

My brother and I look different ________ we are twins.       [     ]
A. unless
B. as
C. though
D. because

答案

举一反三

I have been trying my best to study English ________ I want to have a chance to be a volunteer for the Beijing Olympics.       [     ]
A.until
B. because
C. though
D. when

题型：专项题难度：| 查看答案

I will never forget that terrible accident ________ it happened so long ago.      [     ]
A. only if
B. even though
C. only when
D. ever since

题型：专项题难度：| 查看答案

We have been good friends ________ we joined the same ping-pong team.     [     ]
A.after
B. before
C. since
D. until

题型：专项题难度：| 查看答案

He met many problems ________ he was going over his lessons.       [     ]
A. before
B. as soon as
C. since
D. while

题型：专项题难度：| 查看答案

I won"t take part in the party ________ Joe invites me.       [     ]
A.if
B. when
C. unless
D. because

题型：专项题难度：| 查看答案