7i3n/F,n4T'F'@,G'S With a lot of difficult problems，the manager felt worried _________ all the time.:e'Y,a4m/J/E4Y*f'@;g(`*B+F*K
A.settled:e'Y,a4m/J/E4Y*f'@;g(`*B+F*K
B.to be settled:e'Y,a4m/J/E4Y*f'@;g(`*B+F*K
C.settling:e'Y,a4m/J/E4Y*f'@;g(`*B+F*K
D.to settle:e'Y,a4m/J/E4Y*f'@;g(`*B+F*K