Has ____ how many spies we caught during the war ____ up to now?
A．it been declared; have been set free
B．it declared; have been set free
C．they declared; has been set free
D．they declared; have set free
A
本題在考查對(duì)句子結(jié)構(gòu)的分析能力的同時(shí)考查主謂一致原則，首先排除C、D，然后從句子結(jié)構(gòu)分析可知這是個(gè)主語(yǔ)從句，由it做形式主語(yǔ)，而且是it is declared…句型，只是以疑問(wèn)句形式出現(xiàn)增加了難度，真正的主語(yǔ)是how many引導(dǎo)的從句，從句中的時(shí)間狀語(yǔ)up to now“到目前為止”，應(yīng)該用現(xiàn)在完成時(shí)。當(dāng)主語(yǔ)是個(gè)較長(zhǎng)的句子或短語(yǔ)時(shí)，常用it作形式主語(yǔ)，而把真正的主語(yǔ)放在后面，但依然是主語(yǔ)從句，如：Does it make any difference where we shall have the meeting?
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