/y6I8k0z7K7w*Q9z This CD - ROM is quite useful. It can help us learn English and geography ________.1c+}6h.h)A2D2s7~8d4^+B7y
A. at times1c+}6h.h)A2D2s7~8d4^+B7y
B. at this time1c+}6h.h)A2D2s7~8d4^+B7y
C. at the same time1c+}6h.h)A2D2s7~8d4^+B7y
D. by the time1c+}6h.h)A2D2s7~8d4^+B7y