—I’m not sure ______there are living things on other planets or not .
—Even scientists aren’t sure about it.
| A．where | B．why | C．what | D．whether |
相关试题
—How long have your family lived in the new flat, Jill?
—________ 2011.
| A．Before | B．In |
| C．After | D．Since |
—Hello, could I speak to Sam?
—Sorry, he ________ Australia.
| A．has been to | B．has been in |
| C．has gone to | D．has been at |
________ a basketball match between our school and No. 1 middle school next Sunday.
| A．There may have | B．It may be |
| C．There may be | D．It has |
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