THEY WERE IN THE LIBRARY LAST NIGHT. D- FILL IN THE BLANK A SUITABL...

5. - ĐỀ THI HSG CẤP TRƯỜNG MÔN TA 7
ĐỀ THI HSG CẤP TRƯỜNG MÔN TA 7

5. They were in the library last night.

D- Fill in the blank a suitable preposition: