Don’t talk loudly at the meeting. If you ________, you will have to leave.
A. do                      B. are                       C. did
A
考查狀語(yǔ)從句的時(shí)態(tài) 當(dāng)主句為將來(lái)時(shí)態(tài)是，if引導(dǎo)的狀語(yǔ)從句中用一般時(shí)態(tài)代替將來(lái)時(shí)，而這里需要助動(dòng)詞，不是系動(dòng)詞，所以選擇答案A。
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