—Where is Bob? I cannot find him anywhere.
—He have been off long. I heard him make a call just now.
| A．shouldn’t | B．can’t | C．mustn’t | D．needn’t |
相关试题
. If I had got back 5 minutes earlier, I _________ him.
| A．would see | B．would have seen | C．will have seen | D．had seen |
With the rapid growth of Cyberspace, everyone should be encouraged to use ______ Internet as ______ tool, making it a trend to study in virtual schools in the future.
| A．不填；a | B．不填; the | C．the; the | D．the; a |
----Bruce, I really appreciate your painting. 
---- .
| A．I practice every day | B．Thank you very much |
C．No, I don’t think so | D．Well, it’s not good enough |
It was about 600 years ago __________ the first clock was made.
| A．that | B．until | C．before | D．when |
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