【推荐1】What good news! Such a successful gene ______ in pigs that it enables the pigs to produce human serum albumin, a protein made by the liver. Look! Here ________.

A．have they modified; they come

B．did they modify; come they

C．they have modified; are coming they

D．they modify; they are coming

【推荐2】If you are not rich by the time you are 35, says Ma Yun, then you       the opportunities of youth.

A．are wasting	B．wasted
C．will waste	D．have wasted

【推荐3】My sister graduated from university in 2017 and ________ in a bank ever since.

A．worked	B．has been worked
C．has worked	D．had worked