She had not slept for two days and therefore she wasn’t able to concentrate.

43/50

Not sleeping for two days, she was able to concentrate.

Not having slept for two days, she will not concentrate.

Not having slept for two days, she wasn’t able to concentrate.

Not slept for two days, she wasn’t able to concentrate.

Giải thích

Hướng dẫn giải:

Đáp án đúng: C

Dịch nghĩa: Do không ngủ suốt hai ngày, cô ấy không thể tập trung được.