IF WE _____ THE PLANS CAREFULLY, WE WOULD NOT HAVE HAD SO MANY...

300 BÀI TẬP HAY VỀ CÂU ĐIỀU KIỆN CÓ LỜI GIẢI CHI TIẾT

Câu 9. If we _____ the plans carefully, we would not have had so many serious mistakes.A. studyB. had studiedC. studiedD. were studying