1.It was not until yesterday_____ the business negotiation finally came to a successfully end. (2013-12)a. whenb. thatc.since d. after2.It was your recommendation_____enabled me to be an engineer in this world-famous company. (2014-12)a.when b. who c. what d.that3.It was these small differences______ eventually led the company to be extremely successful today. (2015-6)a.thatb.wherec.thosed. what4.It was not until last July______we started to distributed e-readers and launched an e-book store. (2017-12)a.thatb. whoc. whichd. whom5. Itwasat yesterday’s meeting __________ I misunderstood what you had said. (2018-06)a. thatb. wherec. whichd. who

_____ when dealing with those chemicals.

A. To be more careful
B. Do be careful
C. Be do careful
Do to be careful

____ told police about it.

A. That was me that
B. That was I who
C. It was I that
D. It is me whom

I don't know _____ makes her afraid of having her business discussed.

A. what it is about Mary that
B. that it is about Mary that
C. whatis it about Mary that
D. that is it about Mary that