问题
The secret of happiness is to treasure the things you have now. But someone won’t know it _______ they lost what they own.
A:if
B:while
C:since
D:until;
B:while
C:since
D:until;
正确答案是：
同类题型
103 Can you _____ the difference _____American English and British English
It’s very _____ to feel nervous when you go to a new school.
I usually talk to my friends because I want to be /p’lait/.
Attempts must be made to ______ the barrier(隔阂) between the two communities.
Where is Grace–She with her brother playing basketball at school.