According to ( ) they have told me, they should return within about one week.
A. that
B. it
C. what
D. which
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She ought to ( ) my letter a week ago. But she was busy with her work.
A. have answered
B. answering
C. answer
D. be answering
The law required that everyone ( ) his car checked at least once a month.
A. has
B. had
C. have
D. would have
If ( ) successfully, the plan will completely change the traffic conditions in our city.
A. carrying out
B. carrried out
C. to carry out
D. carry out
We tried () to reach you last night,but your phone was always busy.
A. in doubt
B. in person
C. in hand
D. in vain