[ Tenses ]
You can ask me for help _______.
A. if you have any problems
B. until you had had any problems
C. when you had any problems
D. as soon as you had problems

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Conjunctions › ViewGrandmother _________ grandfather are living with us.
A. and
B. or
C. but
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Do you know the song_________ on the radio?
A. which is being sung
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A. have to
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C. must
Sentence Structure › View
Because they have leaves year-round, tropical rain forest trees are evergreen trees.
A. Simple
B. Compound
C. Complex
D. Compound-Complex