一患者视网膜脱离术后复视，可能由于
A．玻璃体混浊
B．术中神经损伤
C．两眼视力差别较大
D．粘连
E．视网膜病变
参考答案：D
根据《招标投标法》的规定，投标保证金有效期应当超出投标有效期( )天。
A．10
B．20
C．30
D．40
He is a very honest official and never _____ any gifts from the people who sought his help.
A．accepted
B．received
C．took up
D．excepted
