I don’t have to introduce him to you ________ you know the boy..A．until B．unless
题型：不详难度：来源：
I don’t have to introduce him to you ________ you know the boy..| A．until | B．unless | C．since | D．but |
|
答案
| C |
解析
| 当从句中有since+一般过去时，主句用现在完成时，故选C |
举一反三
We have been good friends __________ we joined the music club.
A. before B. since C. until |
| “Everyone thinks of changing the world, _______ no one thinks of changing himself.” A famous Russian writer once said. |
—Would you like to go hiking with us this Sunday?
—Sure, _______ I am busy.| A．until | B．when | C．unless | D．since |
|
---________ when does that shop stay open? ---About midnight.| A．Since | B．Until | C．Before | D．After |
|
— Shall we go for a hiking this weekend?
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