[ Grammar ]
Identify the simple subject in the sentence below.
Does calcium carbonate make the shells of crabs and lobsters hard and stony?
A. calcium carbonate
B. shells
C. crabs
D. lobsters

Random Topics:
Third ConditionalsModal VerbsPrepositions and AdverbsSimple Future - PassiveNarrative, Past TensesDeterminersModal and Auxiliary VerbsNounsWH Questions and Simple Past TenseTime ConjunctionsOther quiz:
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a. encourages
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Identify the kind of the underlined adverb in each sentence.
He lives nearby.
_____
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believe ___ buying good-quality clothes
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