【題目】In Beijing,you can see many people wear masks(口罩) if they _______ out on foggy days.
A.went
B.go
C.are going
D.will go

【答案】B
【解析】句意:在北京,大霧天,你會看見許多人出去時都戴著口罩。本句是if引導的條件狀語從句,當主句是一般將來時或者是含有情態(tài)動詞的一般現(xiàn)在時態(tài)時,從句則用一般現(xiàn)在時表示將來,根據(jù)句意可知,答案應選擇B。

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