Although most species of small birds gather in groups at feeders provided by bird-watchers, the bright red cardinals usually appears alone or with its mate.
A. at
B. cardinals
C. or
D. its
Đáp án D: thành “theirs”
chủ ngữ là “the bright red cardinals” (đếm được số nhiều)
Dịch: Dù hầu hết những loài chim nhỏ tập trung theo nhóm ở những máng ăn được cung cấp bởi các nhà quan sát., chim giáo chủ đỏ tươi lại thường xuất hiện một mình hoặc với bạn đời của chúng.
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