[ Grammar ]
When the children … home, it was obvious that they had been playing in the mud.
A. Were arriving
B. Arrived
C. Had arrived
D. Arrive
Select your answer:

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Gerund or Infinitive › ViewYou don’t need … that.
A. doing
B. to do
Grammar › View
Mastering verb forms and tenses _______ difficult for students.
A. is
B. are
