IgA肾病是最常见的原发性肾小球疾病。
A. 对
B. 错
______ you ever ______ to Boston?
A. Have; been
B. Has; been
C. Have; be
Did; been
______ you ______ to Boston last year?
A. Do; go
B. Have; gone
C. Did; go
Did; went
Julie ______ already ______ breakfast.
A. has; eat
B. have; eaten
C. has; ate
D. has; eaten