[ Tenses ]
By the time I arrived, they __________ (leave).
A. left
B. were leaving
C. had left
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Grammar › ViewThe supervisor explains why he was so proud of Martha.
A. True
B. False
Articles & Quantifiers › View
______ dynamite was invented by Alfred Nobel in 1867.
A. X
B. The
C. A
D. Some
Grammar › ViewMy Chinese class is __________ (boring) my English class.
A. more boring than
B. boringer than
Verb Tenses › View
. Select the sentence that correctly uses present progressive:
A. I study mathematics
B. I am studying mathematics
C. I have studied mathematics
D. I studied mathematics