I regret ______ you that she will not come.
A. to be telling
B. to tell
C. having told
D. to have told
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My brother is a good businessman, ______ I am not.
A. who
B. whom
C. which
D. that
You will receive a confirmation letter ______ us in a week.
A. from
B. to
C. in
D. with
Whenever the professor explained something, she kept smiling and nodding her head from time to time ______ understanding every word of his lecture.
A. as if
B. like
C. just like
D. as though she
Instead of ______ for help, we decided to work it out by ourselves.
A. to ask
B. ask
C. asking
D. asked