问题
Have you ever _______ to Singapore?–No, never.
A:are
B:were
C:was
D:been
B:were
C:was
D:been
正确答案是：
同类题型
Have you returned the book to the library _______?—Yes, I have _______ retuned it.
Look ,that’s Mike,your classmate. –Yes,Let’s go and say hello to_________.
As students, we should work hard and do ________ best to realize our dreams.
When Becky ____ after school, she saw her parents in the living-room.
She looks very sad. I want to help her, but I just don’t know ____ to do it.