. The Himalayan mountains are believed _______ about 50 million years ago.
A. to have been formed
B. that were formed
C. forming
D. to form

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Have toIdiom and TensesPast Simple VS Used toPhrasal verbs and Prepositional PhrasesPreposition and Word FormGrammar - Present Perfect with already, just, yetPassive Voice in Past Simple TensePreposition after some VerbsGoing To Be and WillRelative - ConditionalOther quiz:
Grammar › ViewComplete the sentences with the gerund or infinitive form of the verb in parentheses.
It’s difficult ____________________________ a ball while swimming at the same time. (throw)
A. to throw
B. throwing
Reported Speech › View
“Have you studied reported speech before?”
A. She asked me if I had studied reported speech before.
B. She asked me if I had studied reported speech before?
C. She asked me if I had studied reported speech the day before.
D. She asked me if I studied reported speech before.
Grammar › ViewMy friend ………. football on Saturday.
A. loves to playing
B. love to playing
C. to play
D. loves playing
Vocabulary › View
to carry something away by the movement of water
A. knocked down
B. washed away
C. flood
D. washed up
