________ there are living creatures in the outer space as those on Earth hasn't been proved until now.
| A．How | B．When |
| C．Where | D．Whether |
相关试题
.Ladex does’t feel like abroad.Her parents are old.
| A．study | B．studying | C．studied | D．to study |
—I’m sorry I didn’t finish it on time
—
| A．Fine，thanks | B．No，thanks | C．Thanks a lot | D．Thanks anyway |
- I probably shouldn't have any more cake.
-Oh,. It won't kill you.
| A． | go ahead | B． | hold on, please |
| C． | you're welcome | D． | that'll do |
By the time Jack r
eturned home from England, his son. from college.
| A．graduated | B．has graduated |
| C．had been | D．had graduated |
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