แบบฝึกหัดเรื่อง if

แบบฝึกหัดเรื่อง if clause Choose the best answer for each of the following sentences. 1. The principal…………………….in if you call at 10 a.m. a. was b. is c. will be d. would be 2. if you……………………..those lists, we’ll start arranging the lists. a. check b. checked c. have check d. will have c...