【題目】— Do you know if they swimming with us tomorrow?— I think they will if they free
A.go, will be
B.will go, are
C.go, are
D.will go, will be.

【答案】B
【解析】根據(jù)題干和選項提示可推知句意為：—— 你知道他們明天是否將和我們一起去游泳嗎?—— 我想如果他們有空，他們會的。第一個if引導的是賓語從句，根據(jù)時間狀語，用將來時態(tài)；后一個if引導的是條件狀語從句，用一般現(xiàn)在時表將來。所以答案是：B

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