Bob_____ sitting at the table now.
Đáp án đúng là: A. is
Giải thích:
'Now' cho thấy hành động đang diễn ra ở hiện tại. 'Bob' là chủ ngữ số ít, nên ta dùng 'is'. Do đó, thì hiện tại tiếp diễn là 'is sitting'.
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