______ over and over again, but he still couldn’t understand.
#103480
A
Having explained
B
Having been explained
C
Explaining
D
It had been explained
推荐题目
Police are searching for an escaped criminal who is reported to _____ since he broke away from the prison．
#103031
A
have been missing
B
have lost
C
be missing
D
get lost
I _____ my son _____ a doctor, but he wasn’t good enough at science.
#104712
A
hoped; became
B
hoped; could become
C
had hoped; would become
D
had hoped; would have become
--- Let’s go shopping, shall we?--- Wait a minute. I ________ my housework and it won’t take long.
#100123
A
just finish
B
am just finishing
C
have just finished
D
am to finish
—What should you do if you have problems with your life? — .
#101470
A
To find a friend to talk
B
Find a friend to talk to
C
Finding a friend to talk to
D
Found a friend to talk
Every necessary means____ to protect milu deer which____ very valuable to us. As a result, the number of milu deer is increasing.
#102356
A
are used; is
B
is being used; is
C
have been used; are
D
has been used; are