【正文】
at once B. Once in a while[來源 :學(xué) *科 *網(wǎng) Z* X * X * K ] C. Once more D. At once[來源 : o m] 3. I know it happened, but I can’t ______ it to mind. A. bring B. take[來源 :學(xué)科網(wǎng) ZX X K ] C. think D. consider 4. Yesterday evening we were walking in the street, and ______ I heard a lo ud noise.