Hesetupinbusiness（）hisownandwasverysuccessful.
C
「句意」 他独自一人开始经商，并且做得很成功。
「难点」 on one‘s own 是个常用的介词词组，意为“独自”;of one’s own 表示“某人自己的(东西) ”，如： I have a flat of my own. 我自己有套房子。
Evenifhisletter____tomorrow，it____toolatetodoanything.
Marytiptoedoverandtooktheclockawaybecauseshehatedtohearit___whenshewastryingtogotosleep.
TheBentPyramidoutsideCairo__________ancientEgypt’sfirstattempttobuildasmooth-sidedpyramid.
Our （）sensitivity decreases with age. By age 60 ， most people have lost 40 percent of their ability to smell and 50 percent of their taste buds.
患者男，40岁，2周来右侧咬物不适，冷水引起疼痛，近2日来夜间疼痛，影响睡眠，并引起半侧头痛，疼痛不能定位，检查右侧上、下磨牙面均有深的龋洞。对患牙的应急处理为