_______ he met with the difficulty did he realize the importance of our help.?
A．Even thoughB．Never until?
C．Only beforeD．Ever since?
B?
此題考查從句的引導(dǎo)詞。根據(jù)主句是倒裝did he realize可以排除A、D兩項(xiàng)。如果選C項(xiàng)，則主句應(yīng)該用過(guò)去完成時(shí)態(tài)had he realized,因而被排除。?
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