[ Grammar ]
One of the students ____________ pitching the tent when he heard a loud thud.
A. is
B. are
C. was
D. were

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Grammar › ViewThe tortoise is ________than the rabbit.
A. slow
B. slower
C. slowest
D. as slow
Grammar › View
The teacher tries ……….. the grammar point.
A. Explain
B. To explain
C. Explains
D. To explaining