—The guard keeps watch at the gate.—So he does. Only those knows well could be let in.A. c

—The guard keeps watch at the gate.
—So he does. Only those knows well could be let in.
A. close; who
B. tight; whom
C. tight; that
D. close; he

A. close; whoB. tight; whomC. tight; that(答案→)D. close; he解析：本题考查形容词及定语从句。tight紧的，close密切的。第二空he构成省略关系词who的定语从句。完整表达为：Only those（ who he knows well） could be let in.只有那些他（门卫）非常熟悉的人才可以进去。选D。

和我的回答一样，看来我也对了