选择:Mother dogs have several babies _____.A.on a time B.at a time C.at times D.for a time

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选择:Mother dogs have several babies _____.A.on a time B.at a time C.at times D.for a time
选择:Mother dogs have several babies _____.A.on a time B.at a time C.at times D.for a time

选择:Mother dogs have several babies _____.A.on a time B.at a time C.at times D.for a time
A 没这么个词组
B 每次;一次
C 随时,永远
D 暂时;一度
所以选B,母狗每次都会生出好几只小狗

B 母狗 一次 会生好几只小狗。