One reason Crystal has become so famous is that he is very quick thinking, and is often able to  _____ new jokes about the people and things around him. 
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A
come up with
B
come across
C
come up
D
come to
推荐题目
Opposite my school _______ a book store, _______ was built ten years ago.
#99338
A
is standing, which
B
stood, it
C
stands, which
D
stands, that
---Mom, where is my lunch pack?---Just where it _______.
#100857
A
has been
B
had been
C
was
D
be
You’d better not phone me tomorrow evening; I ____ an important meeting then.
#101881
A
will have
B
would have
C
will be having
D
will have had
With the help of high technology, more and more new substances ___in the past few years.
#101737
A
discovered
B
have discovered
C
had been discovered
D
have been discovered