________ is known to us is that time is limited and precious.
| A．What | B．That | C．It | D．As |
相关试题
—Tom, you are smoking again?
—______? It’s none of your business.
| A．So what | B．How come |
| C．Why not | D．What for |
It was too hard for the firefighters to get close to the burning building. All their attempts to rescue the people trapped were ______.
| A．in place | B．in return |
| C．in vain | D．in danger |
When first _______ to the market, the products didn’t attract much attention.
| A．introducing | B．introduced |
| C．was introduced | D．being introduced |
一My cousin would like to risk the weight-loss pills rather than in a gym．
—Really? She must be mad．
| A．to take；work out | B．to take；working out |
| C．taking；working out | D．taking；work out |
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