I can still remember that it is since the 1990’s, _____ we began to use cell phones,_______ the number of mobile users has greatly increased．
| A．while; when | B．when; what | C．before; that | D．when; that |
相关试题
This cake is very sweet. You _____ a lot of sugar in it.
| A．should put | B．could have put | C．might put | D．must have put |
The World Wide Web is sometimes jokingly called the World Wide Wait because it ______ be very slow.
| A．should | B．must | C．will | D．can |
I have lost one of my gloves. I _____ it somewhere.
| A．must drop | B．must have dropped |
C．must be dropping | D．must have been dropped |
— Write to me when you get home. — __________.
| A．I must | B．I should | C．I will | D．I can |
If I hadn’t stood under the ladder to catch you when you fell, you _____ now.相关知识点
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