【題目】You can go out and play if you your homework.

A. finished B. finish C. will finish D. don’t finish

【答案】B

【解析】句意：如果你完成作業(yè)，你可以出去玩。A. finished一般過去式；B. finish一般現(xiàn)在時(shí)；C. will finish一般將來時(shí)；D. don’t finish一般現(xiàn)在時(shí)。 If引導(dǎo)的條件主語從句，有三種形式：（1）主情從現(xiàn)，主句是含有情態(tài)動(dòng)詞的陳述句，從句的時(shí)態(tài)用一般現(xiàn)在時(shí)。（2）主祈從現(xiàn)，主句是祈使句，從句的時(shí)態(tài)用一般現(xiàn)在時(shí)。（3）主將從現(xiàn)，主句時(shí)態(tài)是一般將來時(shí)，從句的時(shí)態(tài)用一般現(xiàn)在時(shí)。本句是if引導(dǎo)的條件狀語從句，主句是含有情態(tài)動(dòng)詞的陳述句，從句的時(shí)態(tài)用一般現(xiàn)在時(shí)。結(jié)合句意可知選B。

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