题一:
—i don’t understand why you didn’t go to the lecture yesterday afternoon.
—i’m so sorry. but i _________ my homework.
a. had done b. was doing c. would do d. am doing
the water supply has been cut off temporarily because the workers _______ one of the main pipes.
a. had repaired b. have repaired c. repaired d. are repairing
题三:
i ________ to visit you later that day, but i had to phone and cancel.
a. come b. came c. am coming d. was coming
题四:
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