5. My sister ________ for you since yesterday.
A. is looking
B. was looking
C. has been looking
D. looked
Đáp án C. has been looking
Câu trúc: HTHT + since + QKĐ
6. I ______ Texas State University now.
A. am attending
B. attend
C. was attending
D. attended
Đáp án: A. am attending
Câu trúc: HTTD : S + tobe + Ving.
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