【简答题】. I wrote to my parents once a week,____ I was too busy with my teaching work. A.it B.unless C.when D.as
【单选题】My suggestion is that Tom _____ to see a doctor at once.
【单选题】申请住房开发贷款的申请人信用等级一般要求达到( )级。
【单选题】My father and my mother have been married for 30 years, and never once ______ with each other.
【单选题】My mother once helped me make up fairy tales for my dolls.