This type of bamboo grows very fast and it will take only three to five years _____ it can be used in various fields .
| A．before | B．since | C．when | D．as |
相关试题
Bad habits, ____formed, are difficult, and sometimes impossible to shake off.
| A．once | B．before | C．until | D．unless |
Only when you leave your parents for college education _______ how much you love them.
| A．do you realize | B．you realize | C．you will realize | D．will you realize |
The cause he had devoted himself to _______ a perfect success.
| A．proving | B．proved | C．was proved | D．has been proved |
Many experts believe that teachers’ development is _____ the key to better education lies.
| A．that | B．what | C．where | D．which |
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