【单选题】

We must learn to______sentences and to analyze the grammar of our text, for there is no______to the grammar of poetry, to the nerve and sinew of the poem, if one is blind to the poetry of grammar.
A．(A) limn … introduction

B．(B) master … obstacle
C．(C) subordinate… key
D．(D) parse… access
E．(E) osculate… clarity