B 解析: if既可以引導(dǎo)賓語從句又可以引導(dǎo)狀語從句。if充當(dāng)賓語從句的連接詞時,相當(dāng)于whether,詞義為“是否”,遵循賓語從句的時態(tài)規(guī)則,可根據(jù)語境選擇任何時態(tài);充當(dāng)從屬連詞,引導(dǎo)條件狀語從句時,詞義為“如果”,若主句中的謂語動詞用一般將來時,則從句中的謂語動詞通常用一般現(xiàn)在時表示將來。
1. Don't ________________ /'wri/ about me. I am fine. 2. She ________________ /drpt/ her handbag in the symphony hall yesterday. 3. There are lots of fantastic ________________ /saits/ in Jinan. 4. He is an _________________ /'nist / boy, isn't he? 5. Most students hope to __________________ /kn'tinju:/ their education after middle school.