Question

【题目】We have learned ________ three hundred new words this term.
A.at once
B.at all
C.at times
D.at least

Answer 1

【答案】D
【解析】句意：我们这学期已经学了至少300个生词。at once立刻，马上；at all（用于否定句疑问句）根本；at times有时；at least至少。修饰数词，只能选D。