The poor boy is in danger. We should do all we _____ help him out.A．can doB．can
题型：不详难度：来源：
The poor boy is in danger. We should do all we _____ help him out.| A．can do | B．can to | C．can to do | D．can |
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答案
| B |
解析
| 这是一个常见结构，补充完整就是：We should do all we can do to help him out。 |
举一反三
You can’t _____ until tomorrow morning after the blood examination.| A．not only eat but also drink | B．either eat or drink | | C．neither eat nor drink | D．both eat and drink |
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| Is _____ possible to fly to the moon in a spaceship? |
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