Đề thi thử thpt quốc gia 2019 môn tiếng anh (Đề số 20)

The lecture was so boring that John could hardly keep himself _____________ asleep

19/50

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best completes each of the following exchanges.

The lecture was so boring that John could hardly keep himself _____________ asleep

of falling

to falling

from falling

in falling

Giải thích

Đáp án C