____ is quite clear that he has read the book.
A. This
B. That
C. It
D. He
查看答案
____ is known to us all that the earth turns around the sun.
As
B. Which
C. That
D. It
It was not until last July ____ we started to distribute e-readers and launched an e-book store.
A. that
B. when
C. which
D. who
It was at yesterday's meeting ____ I misunderstood what you had said.
A. where
B. which
C. who
D. that
It is Tom ____ often helps me with my English.
A. what
B. who
C. which
D. whose
微信支付 
支付宝支付