Question

—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

Answer 1

D

本題考查形容詞及定語從句。tight緊的，close密切的。第二空he構成省略關系詞who的定語從句。完整表達為：Only those（ who he knows well） could be let in.只有那些他（門衛）非常熟悉的人才可以進去。選D。