They had a boy _________ that yesterday.
A. done
B. to do
C. did
D. do
Chọn đáp án D
Those letters _________ now. You can do the typing later.
D . needn't typing
Over 1500 new houses _______ each year. Last year, 1720 new houses _______.
“Ms Jones, please type those letters before noon” “They’ve already _____, sir. They’re on your desk.”