10．If your call is not answered within two minutes，you ______ to hang up and dial again．（　�。�
A．would be advisedB．are advised
C．have been advisedD．were advised

分析 如果你撥打的電話在兩分鐘之內(nèi)沒人接聽，建議你掛機重撥．

解答 答案：B
句意表達的是真實的假設(shè)，要用一般現(xiàn)在時態(tài)；advise sb to do sth建議某人做某事．故選B．

點評 由引導(dǎo)詞if或unless引導(dǎo)的狀語從句叫做條件狀語從句．在英文中，條件是指某一件事情實現(xiàn)之后（狀語從句中的動作），其它事情（主句中的動作）才能發(fā)生，通常譯作"假如"．注意：在含有條件狀語從句的復(fù)合句中，表示將來時態(tài)，主句是一般將來時態(tài)，祈使句或情態(tài)動詞，從句要用現(xiàn)在時態(tài)來代替將來時態(tài)．

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