If you want to see a doctor, fix the date with him ahead of time. This is a common ___________ in the USA.
A. habit B. law C. rule D. custom
相关试题
For a moment nothing happened Then _____ all shouting together.
| A．voices had come | B．came voices | C．voices would come | D．did voices come |
It’s helpful to put children in a situation ______ they can see themselves differently.
| A．that | B．when | C．which | D．where |
-How amazing it is that astronauts are exploring outer space!
-It’s a challenge, I guess, ______ man against nature.
| A．of | B．for | C．by | D．about |
Why does the Lake smell terrible?
-Because large quantities of water .
| A．have polluted | B．is being polluted | C．has been polluted | D．have been polluted |
- _______. .相关知识点
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