_________to reach them on the phone, we sent an email instead.
#4947
A
Fail
B
Failed
C
To fail
D
Having failed
推荐题目
Go and see her whenever _____. 
#4729
A
it will be convenient to you
B
you will be convenient
C
it is convenient to you
D
you are convenient
“Would you like tea _____ coffee?” “_____, thanks.”
#4890
A
or, No
B
and, Either
C
or, Neither
D
and, Each
 — Did you know any Chinese, Joyce, before you arrived in Beijing? — In fact, never _______ it.
#5016
A
have I learned
B
I have learned
C
had I learned
D
I had learned