[ Passive Modals in Different Tenses ]
Change the sentence to passive voice in past perfect continuous tense: They had been waiting for a long time.
A. They had been waiting for a long time.
B. They had been being waited for a long time.
C. A long time had been being waited by them.
D. A long time had been waited by them.

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Select the complete sentence.
A. The balloon floated up.
B. Although I have six dollars.
C. Running up the street as fast as I could.
D. On the top shelf in the back of the closet.
