If we _________ now to protect the environment, we’ll live to regret it.
| A．hadn’t acted | B．haven’t acted | C．don’t act | D．won’t act |
Later in this chapter cases will be introduced to readers __ consumer complaints have resulted in changes in the law.
| A．where | B．when |
| C．who | D．which |
Yesterday she sold her car, ______ she bought a month ago.
| A．when | B．where | C．that | D．which |
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 |
By nine o’clock, all the Olympic torch bearers had reached the top of Mount Qomolangma, _______appeared a rare rainbow soon.
| A．of which | B．on which | C．from which | D．above which |
Today, we’ll discuss a number of cases beginners of English fail to use the language properly.
| A．which | B．as | C．why | D．where |