问题
_____ 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
B: When
C: Where
D: Whether
正确答案是：
同类题型
It was with great joy ________ he received the news that his lost daughter had been found.
Ladies and gentlemen, please fasten your seat beltsThe plane _________
“time is knowledge”, but I never seem to haveenough of ____. So I am working hard to save them.
___for his views about his teaching job, Philip said he found it very interesting and rewarding.