Theteacher.A.boughttowdozencopybooksforhispupils.B.boughttwodozenofthesebooksforhispupils.哪一个是正确的?我觉得两都正确

Question

The teacher____.A.bought tow dozen copy books for his pupils.
B.bought two dozen of these books for his pupils.哪一个是正确的?我觉得两都正确

Answer 1

都对.
当dozen与数词,或many,several等连用时,不加“s”,所修饰的名词前常省去“of”,例如：
two dozen pencils（两打铅笔）
但a dozen of these people,two dozen of them中应加“of”,因为后面有“these”,“them”,“us”等词.