[ Present Perfect Tense ]
when you use present perfect you select
A. based verb form
B. infinitive verb
C. past
D. past participle verb

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Idioms › ViewThis figure represents only the tip of the ______, since as many as 90% of cases go unreported.
A. iceberg
B. ice
C. ice cap
D. ices
Conjunctions › View
Wendy felt scared ____ she had never done bungee jumping before.
A. unless
B. as
C. if
D. so
Grammar › ViewMy parents are in ______ living room.
A. its
B. his
C. their
Grammar › View
The ship always ___ arrive on schedule.
A. arrive
B. have arrived
C. arrives
D. are arriving