_______time,they would certainly come and help us.A.If had theyB._英语解答

_______time,they would certainly come and help us.
A.If had they
B.If they had
C.Had they
D.Both B and C
Explain it.

人气：139 ℃　时间：2020-02-19 19:45:12

解答

选B.
如果if放在句首,主谓位置不能调换；用虚拟语气时如果倒装,只把助动词、系动词和情态动词放到句首而不把实义动词放在句首,由于C选项中的had是实义动词（拥有）,所以应选B.