1) I .................... been trekking in the icy mountains all day. a) have b) has  2) He .................. been writing a blog about his time in Iceland since yesterday a) have b) has 3) She .................... been eating the popular Icelandic foods since she arrived a) have b) has 4) . How long.....................they been swimming in the lake? a) have b) has 5) . I ..................... been watching the Northern Lights since 8pm. a) have b) has

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