________ many times，I still didn't know how to operate the machine.
#91844
A
Having taught
B
Having been taught
C
Being taught
D
Teaching
推荐题目
all the required papers, he didn’t answer the questions fluently in class．
#93752
A
Having not read
B
Not having read
C
Not read
D
Not to read
I know him ______ a good football player while in college.
#97511
A
to have been
B
to be
C
was
D
had been
Generally speaking, the publishers will send you a specimen copy of their new books when ________.
#98498
A
requested
B
requesting
C
having requested
D
to be requested
.The dying old man opened his mouth as if ___ something.
#98872
A
to say
B
saying
C
to have said
D
was saying.
(2012·洛阳高二检测) _______ of danger in the street at night, she had to go home with a friend _______ her.
#88523
A
Warned; accompanied
B
Having warned; accompanying
C
Warning; accompanying
D
Having been warned; accompanying