Radium salts，which have been found to ______ in bones，give rise to bone cancer.
| A．pile up | B．build up | C．keep up | D．pull up |
相关试题
________, Mr. Smith managed to send his daughter to school.
| A．As he was a poor man | B．A poor man as he was |
| C．Poor man as was he | D．Poor man as he was |
The government managed to have two chemical factories built, though _____ by the citizens.
| A．being opposed to | B．opposed to | C．was opposed to | D．having been opposed to |
— Shall Mary come to the concert with us？
－Not_____she has finished her paper．
| A．since | B．once | C．when | D．unless |
--- Won’t you go to Kathy’s wedding party?
--- No, _____ invited.
| A．though | B．if | C．as | D．once |
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