设幂级数的收敛区间为(-2,6),的收敛区间为()
B
则下列结论正确的是()
The director recommended that she ________ (study) more English before going abroad.
________, John has been to several foreign countries.
The more we looked at the picture, ________.
We were busy ________ (get) things ready for the trial production when he phoned us.