Whycouldn’tyou________ananswerwhenIaskedyouwhyyouwerelate?
C
come up with 意为“提出，拿出”，在句子中表示“你为什么拿不出你迟到的原因”。
Motivationandpersonalitymay________thevaryingdegreesofsuccessinone’scareer.
Asforfamilyeducation,parentsareencouragedtorelyon________ratherthanpunishment.
Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.