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
31. Due to circumstances ____ our control the performance has had to be cancelled.
| A．above | B．within | C．beyond | D．over |
30. Only those who have experienced hardship ____ well aware of what happiness means.
| A．can they be | B．they can be | C．can be | D．they can |
29. The time is not far away ___ the information will be made known ___ more workers will be trained for their jobs.
| A．until; which | B．when; that | C．before; that | D．as; which |
28. The Science Museum, _____ we visited during a recent trip to Britain, is one of London’s tourist attractions.
| A．which | B．what | C．that | D．Where |
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