_______ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
| A．Even if | B． As far as | C．If only | D． So long as |
相关试题
Sorry, we are late,--our plane was _____ because of the heavy rain.
| A．held out | B．held on | C．held up | D．held back |
I’d like to have visited the Palace Museum, but something unexpected _______ to my father.
| A．had happened | B．happened | C．has happened | D．happens |
－What are you busy with ?
－The conference _______ in our city next week.
| A．held | B．will be held | C．be holding | D．to be held |
Attention, coffee lovers! We have for you, the best coffee machine _____ invented.
| A．ever | B．already | C．even | D．nowadays |
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