[ Grammar ]
What is the helping verb in the sentence below?
She is building a sand castle.
_
A. she
B. is
C. building
D. sand castle

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A. every
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I don’t understand the assignment ____ the professor gave us last Monday.
A. which
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I couldn’t repair my bike, _____ I didn’t have the right tools.
A. so
B. for
C. because of
D. therefore
