To those scientists, it still remains to be a question ______ man can go back to the old days with time machine.
| A．if | B．that | C．how | D．whether |
相关试题
The baby is due in May．________________the new house should be finish
ed．
| A．by then | B．by which |
C．by when | D．since when |
Politics meant________________to me for years, for I didn't care about it at all.
| A．something | B．nothing | C．everything | D．anything |
A cool rain was falling, _____________ with snow, causing heavy traffic．
| A．mixing | B．mixed | C．to mix | D．having mixed |
—Did you have a good time in Tai'an last week?
—________________, it was too cold．
| A．Not really | B．Oh, great | C．You're right | D．Yeah, why not |
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