After the Arab states won independence, great emphasis was laid on expanding education, with girls as well as boys ______ to go to school.

A．to be encouraged

B．been encouraged

C．being encouraged

D．be encouraged

筒箭毒碱的作用有

A．可引起支气管痉挛

B．可使血压短时下降

C．有神经节阻断作用

D．促进组胺释放

E．能升高眼内压