Select the correct active form of the given sentence. Every passing vehicle was being thoroughly checked by the guards. (a) The guards were thoroughly checking every passing vehicle. (b) The guards have thoroughly checked every passing vehicle. (c) Every passing vehicle were thoroughly checking the guards. (d) The guards have been thoroughly checking every passing vehicle.

Options

A. The guards were thoroughly checking every passing vehicle.
B. The guards have thoroughly checked every passing vehicle.
C. Every passing vehicle were thoroughly checking the guards.
D. The guards have been thoroughly checking every passing vehicle.

Explanation

(a) The guards were thoroughly checking every passing vehicle. (Correct) (b) The guards h ave thoroughly checked every passing vehicle. (Tense has changed) (c) E very passing vehicle were thoroughly checking theguards. (Incorrect Subject and Meaning)(d) The guards h ave been thoroughly checking every passing vehicle. (Tense has changed)