I wonder ____ the plane will arrive on time. ...

[ Grammar and Vocabulary ]

I wonder ____ the plane will arrive on time.

A. that

B. whether

C. about

D. how

Select your answer:

Random Topics:
Conditionals Complex Sentences To Infinitive or Gerund Prepositions Adjectives (-ed / -ing)Grammar - Present and Past Passive Parallel Structure or Combining Sentences Giving and Asking for Ability Auxiliary Modal

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