[ Grammar ]
Which is the PAST TENSE of DO
A. does
B. do
C. did
D. done

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Grammar › ViewWhich is the complete subject of the following sentence?
The white blood cells in your blood fight disease.
A. The white blood cells
B. The white blood cells in your blood
C. The white blood
D. The white blood cells in your blood fight
Modal Verbs › View
. Choose the sentence that uses a modal verb to express permission.
A. You must finish your dinner before dessert.
B. Can I leave the table now?
C. They should study for the exam.
D. He will arrive soon.