[ Grammar ]
Mother has been baking a cake_________.
A. since he was ten
B. this morning
C. since morning

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Tenses Usage › ViewRenewable energy _____ a key role in achieving global sustainability.
A. play
B. plays
C. playing
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_____ more careful, we would have completed the work.
A. Had we been
B. Were we
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She (be) ________ twelve years old.
A. is
B. being
C. be
D. was
