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Complete the starship captain's log. Select ALL the phrases that grammatically complete the sentence using a reduced relative clause.
The alien vessels ____________________ suddenly vanished from our radar.
The correct answers are orbiting the gas giant and damaged in the recent skirmish.
"orbiting the gas giant" is an active present participle phrase reducing the clause which were orbiting the gas giant.
"damaged in the recent skirmish" is a passive past participle phrase reducing the clause which had been damaged in the recent skirmish.
"which were transmitting a peace signal" is grammatically correct but is a full relative clause, not a reduced one.
"were orbiting the gas giant" creates a run-on sentence with two main verbs ("were orbiting" and "vanished").
"having damaged in the recent skirmish" is incorrect because it uses an active perfect participle for a passive meaning.